|1: ||I have a student who claims he has seen a new
moon (i.e. he could make out the shape in the
sky, albeit very faintly). Do you think this is
possible (either during the day or the night)? My
understanding is that a new moon is positioned
between the Earth and the Sun, making it
impossible to see at night, and not in a position
to reflect light to Earth during the day.
|2: ||Why do all the planets in our solar system orbit
the Sun on a relatively level plane? How come
there aren't planets rotating at angles of, say,
90 degrees from our perspective?
|3: ||Why does Venus rotate west to east instead of
east to west.
|4: ||I have read that Europa, one of Jupiter's moons
has water on it. Why is that and do the other
moons have water too? If not, why not?
|5: ||Is it true that Jupiter gives off more heat than
the Sun? And why?
|6: ||When do people think the sun is going to explode?
|7: ||Why do some planets have rings? Why do none of the
inner planets have any?
|8: ||How is gold made?
|9: ||What is the name they are thinking of naming the
recently discovered planet in our solar system?
|10: ||What is the new's planets name and how far is it
from Earth? Why do scientists care about this
|11: ||Why is the sun hot ?
|12: ||How much liquid is on Mars?
|13: ||Is there any other planet like Earth in the
universe (a planet that has air, water, gravity
and so on)?
|14: ||How do black holes prevent light from passing
|15: ||What makes a planet different than a star? Has
anyone been out of our galaxy before? If so,
when and where did they go?
|16: ||We're studying the universe right now in science
and it said that the universe is expanding but
the book or my notes didn't say how fast it's
expanding, I was hoping you could help me.
|17: ||I am going to be teaching a lesson of the origns
of life/universe. I have been looking for other
cultures interpretations on the orign of life but
haven't found anything yet. Have any ideas or
|18: ||How far away are the stars?
|19: ||What is the temperature in space?
|20: ||What is a galaxy?
|21: ||How old is the Universe?
|22: ||Why does the rising moon look so big?
|23: ||What is a light year?
|24: ||Why is the sun's corona hotter than the surface
of the sun
|25: ||If you were somehow let lose in space, without a
spacesuit, how long would you survive?
|26: ||If the theory of the Multiverse is correct, can
one change to a single universe effect the
outcome and future of another? If there is more
than one universe, are they linked together or
are they totally isolated from one another?
|27: ||What path does the moon's orbit travel around the
|28: ||Why are there phases of the Moon?
|29: ||How does the Moon control the tides?
|30: ||My question has to do with the moon and the sun.
I heard that the moon is slowly moving away from
the earth at a measurable rate each year. I also
heard that the sun is shrinking at a measurable
rate each year. If both these things are true
how could the earth not burn up millions of years
ago if the sun was bigger and wouldn't the moon
have been touching the earth?
|31: ||If Novas and Super Novas are so far away from our
galaxy and our shuttles can't make it through
Pluto, how do we know what they look like?
|32: ||How old is the universe?
|33: ||How can a star be formed? From the big bang the
collapse of gas clouds under gravity is supposed
to generate the heat required for nuclear fusion.
However, a gas cloud would be too hot and the
outward pressure would prevent the collapse. I
understand that molecules in the cloud collide
and radiate enough heat away, but according to
the theory, the bang is made mainly of hydrogen,
with a little helium with other elements formed
inside stars. Helium can't form molecules at
all, so the only molecules formed would be
molecular hydrogen. Even this is easily
destroyed by ultraviolet light and needs dust
grains to form.
You and I know dust grains require heavier
elements. The only coolant left is atomic
hydrogen, and this would leave gas clouds over a
hundred times too hot to collapse.
|34: ||How far away is Mars from Earth ?
|35: ||What was the closest distance between Saturn and
|36: ||How can you find a parallel universe if you don't
even know it's there?
|37: ||Within the light spectrum there is a range
visible to us. Electricity in the form of
lightning is visible. Is there a visible form of
|38: ||Is it possible that an animal could set foot on
|39: ||In the theory of the formation of the moon, what
happened to the large body that hit the Earth?
|40: ||Has a planet or star gone into a black hole?
|41: ||If the sun blows up would we all die, and if yes,
how long will it take?
|42: ||How many comets have almost hit the Earth?
|43: ||How do scientists find out the gravity on other
planets if they've never been on that planet?
|44: ||Has the volcano on Mars ever erupted ?
|45: ||When will Betelgeuse die? How will we know when
it's going to die?
|46: ||How do scientists predict a solar and lunar eclipse?
|47: ||What are the main differences between stars and
|48: ||What are some theories about the innards of a
Black Hole? And also, what are some theories
about the outlet of a Black Hole?
|49: ||I have heard some talk about a tenth planet,
supposedly called "X". What I have heard is that
this planet orbits (When thinking of our Solar
System on an XY Axis) On the Y axis as opposed to
the other planets which rotate on the X axis. I
have also heard that this planet could have
caused the annihilation of the dinosaurs. Is
this something true or just a myth?
|50: ||Is Pluto a terrestrial planet or is it a gas giant?
|51: ||Why does the sun get sunspots
|52: ||What objects do solar flares damage?
|53: ||Is the core hotter than the corona?
|54: ||An astronomy question: Does the length of time
the moon is visible from Earth change
month-to-month or season-to-season? We know the
length of day changes with the sun, but we're
wondering about the moon. Also, we know the sun
and moon are not orbiting in the same plane
(relative to the earth) because if they were, we
would have solar eclipses every month. So, how do
the orbital planes differ for the earth around
the sun and the moon around the earth? Thank you
|55: ||Why are there two different families of planets,
Jovian and Terrestrial?
|56: ||Hello. I'm a student in DPHS. I have a question
about black holes. Could you answer it, please?
My question is: I've learned that there are many
black holes in our galaxy and they are moving.
What will be happened, if two black holes collide
against each other? Thanks for your favor.
|57: ||Why do asteroids concentrate between Mars and
|58: ||It is known that there are small asteroids with
very irregular shapes. What are the forces that
give these asteroids their shapes? What shape do
you think a neutron star that does not rotate
around its axis can have?
|59: ||Hey, I'm having a debate with a kid in school
about what would happen to your body if it was
floating out in space without protection of a
space suit. Would you implode?
|60: ||How hot is the sun?
|61: ||Why does the moon have holes in it?
|62: ||How long would it take for us to know if the sun's light had been extinguished?
|63: ||Are there clouds on other planets? If so,
wouldn't there have to be water to form the coulds?
|64: ||Has any form of life been discovered on a planet?
There are billions and billions of stars and
galaxy's and planets, and we still have not
discovered life, why not? If we did how would we
even communicate if they are beings?
|65: ||Is their a new planet in the galaxy?
|66: ||Why is there life on Earth and not at other planet?
|67: ||What are planet rings made of?
|68: ||Why is there a ring around Saturn?
|69: ||What is Saturn's rings made out of?
|70: ||Why does Saturn have rings and the other planets do not?
|71: ||How does the earth stay up? Why is the earth round?
|72: ||How far are stars from Earth?
|73: ||How many stars are in the sky?
|74: ||How many times does the Moon orbit the Earth in a year?
|75: ||Is there more than one universe?
|76: ||Will we ever be able to space travel out of the
Milky Way and into the Andromeda Galaxy?
|77: ||What shape do you think a neutron star that does
not rotate around its axis can have?
|78: ||I want to know why Pluto is not a planet
|79: ||Is it true that the Big Bang was created by
universes that collided?
|80: ||How many planets have been discovered outside our solar system? Also, what are their names?
|81: ||What are the names of the 63 moons of Jupiter?
|82: ||What are the names of Mars's two moons?
|83: ||How many moons are there on planet Neptune and what are their names?
|84: ||Is there an equation which calculates how long the moon is visible on any given day/night at a given location, if we know where we are, which day it is and which phase of the moon it is?
|85: ||Has a planet or a star gone into a blackhole?
|86: ||What is the life cycle of a small star and a massive star after the red giant stage? Also, do you have any interesting facts about star's life cycles?
|87: ||Can an eclipse help or destroy the Earth in any way?
|88: ||Why isn't Pluto a planet anymore?
|89: ||Thank you for the reply.... The telescopes I'm looking at are on ebay. They are both sold by the same company and are the same brand of telescope. They are Newtonian, Baytronix short tube reflector scopes. If you have the time / energy you can easily find them by logging on to ebay and search for telescope. Each scope has the list of specs and someone like you would know the meaning, but its foreign to me. When I went to their other items for sale I found the motor for $50 (if it is the same one) so perhaps the money is in the larger mirror like you said. Is the larger field just to make it easier to find your target? It appears the difference in magnifiication is 1000 vs 1400. Is that a lot?
|90: ||How does the universal balloon demonstrates the way that astronomers believe the universe is changing?
|91: ||Is there proof that there is CO2 and H2O on Jupiter?
|92: ||How were planets made? |
Do planets grow?
Why are the planets round like a sphere?
|93: ||I am a retired person and I have a question. How
many miles the NASA space ship has to travel to
get out of Earth?
|94: ||I would like to have a long life enough to see
the smash of the galaxies. If by that time humans
still exist, what will they see or feel as the
first symptoms of the crash?
|95: ||I understand that when a sun begins to die and starts to expand to red giant or supernova the protons have too much great forces acting upon on them that they touch too many protons that they are repelling so much, yet they barely can even push because another atoms are squeezing the protons. Basically the proton needs to escape to somewhere. But how do they escape the sun and where do they go to?
|96: ||How long does it take a rocket ship to get to the
moon, and how fast will the rocket be going?
|97: ||How many days does it take to go from Earth to
|98: ||How did the asteroid belt form?
|99: ||How many moons are there in our solar system? Are
the other moons of different colors and sizes
than our moon? Are there other interesting facts
about the other moons? Have any other moons been
|100: ||Why is Pluto so little? Is Pluto made out of
rock? Is Pluto an asteroid or a planet?
|101: ||How can the sun stay togther if its made out of gases?
|102: ||Is Pluto a planet or a moon?
|103: ||How does the sun move around the planet?
|104: ||Why is the Earth more like a Sphere than like a
|105: ||How did the sun got created?
|106: ||Is there life in outer space?
|107: ||Will astronauts ever be able to land on Mars?
|108: ||How do scientists know how long the sun is going to survive?
|109: ||I heard that in quantum physics there is something like 11 dimensions. How would you know if something is coming from a different dimension or something like that? What would be an example of something going through or coming from those different "degrees of freedom?"
|110: ||Is there a limit on how low a frequency of RF can be generated by interstellar processes? What is the lowest frequency ever detected in space? This question bears on an interesting effect I worked out about gravitational lenses. Thanks.
|111: ||What happens beyond an event horizon?
|112: ||What exactly are white holes, and how are they formed?
|113: ||What is dark matter and how does it react to
|114: ||How do sciectists know what chemicals are in a star?
|115: ||What chemicals are in MOST stars?
|116: ||What is the difference between the ecliptic line And the equatorail line?
|117: ||I and my friend are doing a report on one of the messier galaxies, M104. We have looked online and some sites say that it is in the Virgo constellation, and some say that it is not. Do you know which one's true? Thanks!
|118: ||Hi! When I read or hear about asteroids, specifically about those that have impacted the earth at sometime in the past, I notice that the authors compare the force that the asteroid impacted the earth with to the strength of the atomic bomb. (Example: The asteroid that killed the dinosaurs impacted the earth with the force of several atomic bombs) Now I know to calculate the force of an object that would hit the earth (f=ma) (correct me if that is not how you calculate the force of an object that would impact earth - must I know the objects speed, etc?) but how do I compare that force to the explosion of an atomic bomb? It would be interesting to see, for example, How the impact of a 10-ton object made of a various material, and the destruction that such an object would produce,would compare to the destruction of an atomic bomb. I would assume that 1 atomic bomb would produce the kind of destruction seen in Japan during WW2? Thank you so much for your help, Happy New Year!
|119: ||Where did stars come from and why do we have them?
|120: ||How far has space exploration gone and why don't we go farther?
|121: ||Why is there such a small amount of Lithium in the universe? (Subsidiary questions: Does Sol have less or more than most stars? If so, why?)
|122: ||Why are the planets round?
|123: ||Hello! Thank you for your answers to my previous question. I have another question involving relativity: Imagine that somehow, one is able to produce a finite acceleration for a given amount of time, or indefinetly (I know that this would require infinite energy but please bear with me). Using this device, the person accelerates an object. Eventually, the object approaches the speed of light. Given my current knowledge, an outside observer seeing that object would notice that it is constantly approaching the speed of light, but (according to the observer) it would take an infinite amount of time for the object to reach, and pass, the speed of light. Is this correct, why is this? However, the object that is accelerating would notice that it would take a finite amount of time (according to it) to pass the speed of light. I know this is similar to the case in which an object is observed passing the event horizon of a black hole. (an outside observer would have to wait an infinity to see the infalling object pass the event horizon, but the infalling object would pass the horizon in a finite amount of time) Now for my second question: Can the accelerating object (or the object that passes the event horizon) still be considered as traveling back in time (when it passes the speed of light according to it, or when it passes the event horizon according to it)? Why or why not? Thank you for your help.
|124: ||Hello! I have recently tried to calculate the gravity of a black hole at the event horizon. In other words, I want to calculate the surface gravity of an object if the escape velocity to leave that object is the speed of light. But I dont think I did the math right. I believe that the required gravity is less than infinity because there is only infinite gravity at the singularity. How can I determine the gravity of an object when the escape velocity is the speed of light (or more)? Please show how to calculate it. Thank you so much for your help!
|125: ||What keeps earth from collapsing in on itself
like at the end of a star's life? Is it not big
enough or what?
|126: ||I want to know why we always look at the same
face of the moon. Can you explain to me the reason?
|127: ||Because of certain chemicals (ethyl formate)
found in a big dust cloud in the middle of our
galaxy, Saggitarius B2, is it true that the Milky
Way would technically smell like rum and taste
|128: ||Can you explain why the planets are round?
|129: ||How do we know that the earth revolves around the
sun? Is the sun in a fixed position? The sun is
seen crossing the sky, but so is the moon. Isn't
the center of anything relative to your position?
|130: ||Do you believe the big bang will reverse itself,
as a few people have predicted, and suck back in
to its "origin"?
|131: ||What happens to light in a black hole? Is there an end to a black hole?
|132: ||Why is Uranus tilted at a 90 degree angle?
|133: ||How do you know what planets and stars are made of if you can't actually take samples?
|134: ||How can you tell how many miles or light years away something is if you can't go there? What sorts of instruments do you use?
|135: ||Will any of the planets ever go out of orbit?
|136: ||Is it possible if we brought all the supplies to
live on the Moon?
|137: ||Do you believe in aliens?
|138: ||If you were on Saturn, could you see the ring going around it?
|139: ||If you could walk on Io, would the ground be hot because of all the volcanic activity?
|140: ||How many man-made objects orbit the Earth? What are they?
|141: ||Why did volcanoes on other planets stop erupting?
|142: ||Why does Venus have a retro-grade rotation?
|143: ||What is the oldest planet in our solar system?
|144: ||How does the gravity of black holes exist without any mass?
|145: ||Are there any other planets in the solar system other than the 9 we are familiar with?
|146: ||If you throw something in a black hole, where does it go and what happens to it?
|147: ||If we melted Mars' ice cap, do you think the water would be useable? Could we create an atmosphere?
|148: ||We've been studying the planets in my science
class. I read this article in the Time magazine
(March 1998), that there might be water on one of
Jupiter's moons, Europa. I think that the title
of the article is misleading "Aliens in a Slushy
Sea". They say ice that they found may mean some
liquid under the ice layer. My reading of the
article tells me that they are trying to make us
think that there may be water on this moon. I
find that hard to believe! Couldn't the ice that
they found be frozen Carbon dioxide and not
water? Do you have any more info. on the subject?
|149: ||I have heard that they have taken different
pictures of the atmosphere from outside the
world. Can you please direct me where I can find
pictures that would show me different information
about the atmosphere. I would like to study the
atmosphere and take pictures from outside the
|150: ||Is there really life on Mars? What evidence is
there that there may or may not have been life on
|151: ||I am really interested in UFOs because it is
strange. I searched on the internet and found
some pictures that are suppose to be real. I
will like you to direct me to more information.I
hope you are interested , too? I also hope you
believe in them, because I do.
|152: ||What makes a supernova? What types of energy does
a supernova give out when it explodes?How far
does the explosion of the supernova go? How
common are supernovas?
|153: ||I want to know which planet has the most moons. How many do Saturn and Jupiter have.
|154: ||How big is the ozone hole? Is the hole getting
bigger or smaller? Can the ozone layer/hole be
repaired, by nature or otherwise? How long do
CFCs take to reach the ozone layer and eat it up?
How big will the ozone layer get by the year
2000?How could we stop the ozone hole from
getting bigger? Will the ozone hole affect the
earth's gravity? What will happen if the hole
gets really big? Would we die?
|155: ||What we already know is that there is water and
snow on the moon. Our question is why does
Earth have clouds and the moon doesn't?
|156: ||Is there really weather on planets, and if there
is, is it like on earth or is it colder or hotter?
|157: ||How do thay know there is water on the moon ? Why
do they call it the moon? What year did the
Astronauts go to the moon and what are their
names?Who invented NASA?
|158: ||What is the celestial event(s) that causes the
calendar adjustment of a leap year?How many days
with February 2000 have in it?
|159: ||I want to find out if UFOs are real or aliens are
|160: ||If our solar system had two suns, would it be
summer year round and would the sun ever set
(i.e. would we ever experience nighttime)?
|161: ||I was wondering if you could tell me about the
moon and about eclipses. Why is it harmful to
your vision? Ive heard that eclipses of the sun
hurt your eyes. My teacher said hes seen moon
eclipses that looked red. Why would that happen?
|162: ||Could life survive on a Asteroid? On Earth there
are six characteristics of life. In the search
for alien life forms are the characteristics of
life the same?
|163: ||Does space ever end?
|164: ||Why is the sun so hot and bright?
|165: ||Is there a fourth dimension?
|166: ||Why is space black?
|167: ||How hot are sun spots?
|168: ||If there is an end to the universe, what's beyond
|169: ||How many solar systems could be in a galaxy if
there a billions of stars in a galaxy?
|170: ||What created the Big Bang?
|171: ||I have learned that Mars has a thinner atmosphere
and smaller acceleration due to gravity compared
to Earth. If a lander similar to the Pathfinder
were to land on Earth in the same way, would it
fall faster or slower than the one on Mars?
|172: ||What if a big comet hit the Earth? What would happen to us and how are you trying to stop it?
|173: ||How are stars formed?
|174: ||Is there any possible way that people here on
Earth could live on other planets like Saturn,
Jupiter, or the Sun?
|175: ||Why do stars twinkle?
|176: ||What are comets made of?
|177: ||How big are the planets compared to the Earth?
|178: ||Is there any other planet with the same atmosphere as us?
|179: ||Where does the sun come from?
|180: ||How did people discover the planets?
|181: ||If you are on the moon, does the Earth have
phases similar to moon phases? Would they be the
same or reversed?
|182: ||Why can't we send an astronaut to Jupiter on a satelite or probe? Will we ever be able to send a human to the outer planets?
|183: ||We currently know that Dark Matter is matter that
is in outer space and occupies a great deal of
matter in the Universe. It could be many things
such as planets, dormant stars, or black holes,
but we are seeking the truth... What is Dark
Matter? What do we need to know about Dark
Matter that we dont? Is there any significant
information about how it differs from the matter
|184: ||Why do the sun and moon look bigger when seen on
the horizon than they do when high in the sky?
|185: ||I am currently participating in a project where I
have to design a space settlement. I would like
some data on the materials and the processes
being developed/studied here. If you have any
such information, could you help me?
|186: ||In regards to extraterrestrial life, I wonder
about their "rate of life". I mean, could what
we call a second be a year for their species.
So, a message from us like "Hello" would be a
lll...oooooooooo." If our thought processes are
at two very different rates, then communication
would seem impossible. OR, is there one rate of
life in all the universe? It seems that this
would have to be the case for any contact to
occur since the probability of another species'
"rate of life" being close to ours appears to be
zero. Do you think our rate of life is connected
to the speed of light. So, for example, an alien
species with a rate of life one hundred times
ours would see light travelling one hundred times
slower? (or faster?)
|187: ||As a scientist, how would you explain how the
Earth was created after the Big Bang occurred?
Where did animals, plants the human race come from?
|188: ||If the sun were to explode, what is the
probability that human life forms would survive?
Is there a possibility of a "Counter Earth."
|189: ||Could a black hole be destroyed if the amount of
mass that was sucked in was bigger or about the
size of Jupiter?What is a worm hole? How are
they formed? Could you enter one, and what would
object inside or outside the worm hole look like?
What would happen if two black holes were side by
|190: ||Why are red stars cooler than white stars? I
thought red things were hot.
|191: ||I'm interested in the solar system. I want to
know about the things you are learning. I want to
know about the special interests you have to
share with me and what you are specifically
|192: ||I am currently participating in a project where I
have to design a space settlement. I would like
some data on quantum computing.
|193: ||Measuring light years:How is the speed of light
actually determined? How could you measure
something that's speed is inconceivable to us?
If we went somewhere else...say a star and
watched the light from the Earth reach us, would
it be like watching a movie?
|194: ||What would happen to me if I went through a
black hole? Would I end up in a different
|195: ||Do planets ever stop growing?
|196: ||Why do we orbit the sun but it doesn't orbit anything?
|197: ||Does the solar system ever end and if so how ? Is there a wall or does it just go on forever?
|198: ||How do we get the satellites to other planets
like Jupiter so fast if it takes a regular rocket
5 years to get there?
|199: ||How do we know how stuff really is out there if
it's too far out to explore and would take years
to get to?
|200: ||I am not in school. I am in a nursing home and
cannot get to the library so the net is my only
way of learing. My question is why are some
tides higher than others? Thank you if you can
|201: ||How do you know how many galaxies there are in
|202: ||How did the carbon get in the universe to form
|203: ||A student read that the star Arcturus was moving
differently than other stars (perhaps in a
different direction?). Do you have any
information on this?
|204: ||Please answer our question about space. The sun
is out in space. Around the earth it gets very
cold and the air around us is cold. Out in space
is it cold warm or very hot?
|205: ||Can a moon have a moon? Is there any such
thing in our solar system or evidence of it in
|206: ||How are Solar Flares are related to the Magnetic
Poles on Earth? How they work? I can't find that
answer in any of the books I looked through.
|207: ||Why isnt there any oxygen in the universe and the
planets around us?
|208: ||If we send all of our nuclear weaponry at Jupiter could we ignite it to become a star?
|209: ||How do scientists know how old a star is?
|210: ||How do scientists know a black hole is out there?
|211: ||What would be the difference between a blackhole with a naked singularity vs. a blackhole with an event horizon. Other than the obvious, what would be difference between those two astronomical anomalies?
|212: ||If antimatter exists, how could it possibly be contained? If antimatter reacts with matter how could it be contained by matter? I heard that scientists had contained a particle of antimatter at Princeton Physics lab. I was wondering how they did this.
|213: ||Do black holes really exist? If yes, why we have
not found them moving around neighboring
|214: ||Can you hear a space ship in space or a super
|215: ||This question is not for school. I wanted to now
sense you can't look at solar eclipses directly.
Can you use sun glasses, 3d glasses or a cell
phone to look at them without hurting your eye?
|216: ||How would I calculate the magnitude and
direction of acceleration of a galaxy moving
towards another galaxy? The only values I know
are that both galaxies mass = 1.42 x
|217: ||How does the lunar orbit compare to a circular
|218: ||How do other planets affect Earth's gravitational
|219: ||Does the sun rotate? |
|220: ||What would happen if the world rotated in the
opposite direction than it already does? |
|221: ||How many moons are on the planets? |
|222: ||How are scientists helpful to us?
|223: ||Is there any chance of life up in space? |
|224: ||Why is Jupiter's red spot red and what keeps it
from dying out? |
|225: ||Did Mars ever have life on it and was there water
|226: ||Why can't we see other stars or their solar
systems/and how far are we from the other solar
|227: ||Have the planets ever lined up? If they have,
was the year? |
|228: ||Is the sun the hottest star in the Universe? |
|229: ||What is a nebula and is it the first part of the
sun's life cycle? |
|230: ||Why does Saturn have a ring that floats? |
|231: ||About how many stars are in space? |
|232: ||What are Saturn's rings made of? |
|233: ||How are galaxies made? I know we live in the
Milky Way. |
|234: ||What is the biggest star that scientists know? |
|235: ||How do all the planets seem to be floating and
they don't fall in to space? |
|236: ||How did the Solar System started and when?
|237: ||How come our solar system does not go off to
|238: ||Why is Venus hotter than Mercury if Mercury is
closer to the sun? |
|239: ||Why are most planets and stars spherical? |
|240: ||How are planets made? |
|241: ||If the universe is expanding, how is that
can collide? |
|242: ||Is it possible for any life to exist on Saturn? |
|243: ||When you go to space, can you get out hydrogen
from the sun? How do you get hydrogen on earth?
|244: ||How does the asteroid belt form? |
|245: ||Where did the planets get their names? |
|246: ||Why is the sun so bright and hot?What instruments
do scientists use to study the sun?How big can a
solar flare get? |
|247: ||Why is the sun so bright and hot? |
|248: ||How does a galaxy form? |
|249: ||How earth is different from the other planets?
|250: ||Why do planets have different layers?
|251: ||How is Mercury different from the other inner
|252: ||How many stars are in the galaxy? Is it true that
if you go into a black hole, you can still come
|253: ||We know that the sun is not the biggest star, but
is it the hottest star?-Thanks. |
|254: || Why do the stars orbit each other?
|255: ||Is Pluto gas or rock? |
|256: ||How are ocean tides formed under the influence of
the moon and the sun, and the influence of the
revolution of the earth? |
|257: ||Which stars are cooler red or blue? |
|258: ||How was space discovered? |
|259: ||Why do planets have different colors? |
|260: || Why is the sun hot? |
|261: ||Light has many sources. The greatest is the sun.
Are scientists using other light from other stars
to produce energy? |
|262: ||Can you tell me how bright is the sun? |
|263: ||I have tried to calculate the moon's gravity at
100,000 km distance from its surface by using the
inverse square law, but I get confusing results.
Please help me. |
|264: ||Will black hole travel like other celestial
bodies. Is there a chance of our earth and solar
system being attracted by a Black hole. |
|265: ||Can you explain string theory for me? Thank you. |
|266: ||What are the most influential factors of water tides? |
|267: ||How do we know the distance that a star is from
earth? How is it calculated? Also how do we know
how hot stars are? And how do we know that there
is plasma on them? |
|268: ||How do we measure the radius of other planets?
|269: ||Could any of the "gas giants" (or other planets)
in our solar system ever become Sun's? Let's say
the Sun burns out, if Earth has somehow been saved
from certain demise, could a "gas giant" be
ignited as if it were a spare lightbulb? If so,
would our solar system change directions and start
to rotate around that planet? |
|270: ||Which gases are there on Mars? |
|271: ||How does nuclear fusion fuels our sun? |
|272: ||Does gravity prevent Earth from flying away from
the Sun OR flying into the Sun? Please explain
answer. Thank you. |
|273: || Does the solar systems form in the center? |
|274: ||How far away is Earth from Saturn? |
|275: || Why does Jupiter have a red spot? |
|276: ||How long would it take to reach the solar system
from earth? |
|277: ||Are stars hot or cold? |
|278: ||Does Pluto have an atmosphere? |
|279: ||What would you need to survive on Venus? |
|280: ||How far is the very first satellite launched into
|281: ||How many galaxies are there in the Universe?
|282: ||What is the approximated distance that the earth
is approaching the sun each day, week, month, year
or other method of measurement used scientifically? |
|283: ||Why is global warming so confusing? |
|284: ||What is the difference between a black hole and a
worm hole? |
|285: ||I understand how gravity is the curvature of
spacetime, but what quality of spacetime allows it
to move back to exactly how it was before a body
of some mass influenced it? What balance keeps
spacetime constantly "smooth"?
|286: ||How many solar systems are in the milky way galaxy? |
|287: ||Is Pluto a gas or solid planet?
|288: ||According to Stephen Hawking, the laws of Physics
allow the Big Bang to happen, because the random
motion of subatomic particles generated energy to
create an explosion. How exactly did these
subatomic particles appear. If the Big Bang was
caused by the random motion of such small
particles, then what created such subatomic
particles in the first place, and what came before
them. Also, how exactly did the Big Bang generate
forces like gravity to come about in the universe? |
|289: ||What are planets made of? |
|290: ||If we know of sun based systems throughout space,
is it possible to have a system based on massive
planets or other bodies (excluding black holes,)
or would the mass be too great that it collapses
in on itself? |
|291: || If the rest of the universe had earth's gravity,
would we be floating? And if so, how high would we
|292: ||Is there more than one universe? |
|293: ||Is the world ever going to end? |
|294: ||Where have humans explored in space, and what are
the details to what they have found? Thank you
|295: ||If a comet passes too close to Earth, what might
|296: ||Why some planets have rings and others do not? |
|297: ||My friend refuses to believe that the earth
rotates around the sun because all he believes in
is religion , he refuses to believe any logic.
What is the easiest way to prove to him that the
earth rotates around the sun and not the other way
|298: ||We estimate the temperature of a star from its
color. But what if the star is moving away from us
at a constant rate? Then, its light would be red
shifted. So, how will we know its temperature? |
|299: ||Does Pluto have any moons? |
|300: ||Why the sun does not fall on the earth?
|301: ||How are stars aligned? |
|302: ||Can you explain to me why is a ball on a string
like a planet in its orbit? |
|303: ||I was wondering if there are billions of stars in
the galaxy and we are inside of it, why do we see
dark nights? Wouldn't the space always be bright?
|304: ||What is the Shape of Our Universe, and where is it
situated? I would also like to know what is there
outside the Universe? |
|305: ||Why does tides occur on seas and oceans but not on
ponds and lakes? |
|306: ||What makes a planet different from a star?
|307: ||How far away are stars? |
|308: ||There is an article on your site about the
gravitational pull of the planets upon each other.
My question is what happens when the earth passes
through the gravitational field between the sun
and another big planet such as Jupiter or Saturn.
So there would be some gravity between the earth
and Jupiter, but there would also be gravity
between the sun and Jupiter and the earth would be
passing through this field. Can this be measured?
What happens? Casey the Curious. |
|309: ||Does our solar system have a name? All we say is
"sun system". |
|310: || I have children in Grades P-2. One of my young
students asked me if the earth is round because of
gravity, how come the other planets are round that
have no gravity - I tried to explain the mass and
gases idea to them and they looked at me as if I
was from another planet. How do I explain the
reasons planets are round in simple terms they
will understand. Please keep in mind these are 4-6
years old children. |
|311: ||How was our Earth made? |
|312: ||Is our sun really a star? |
|313: ||What instrument did you use to gather information
about stars? |
|314: ||Are there really Aliens from outer space? |
|315: ||Would a black hole be able to eat an object many
times bigger than its own mass? If not, what would
the reaction be? |
|316: ||What would the reaction be if a black hole crossed
paths with another black hole of the same size? |
|317: ||What would happen to the moon if the earth is
gone? Will the moon find another planet to circle
around? If yes, which would be that planet? Would
the moon go on in the same circle without a
planet? Will the moon be gone before us or will be
death with us? What will happen?
|318: ||Why does the Earth rotate on an axis?
|319: ||Why the ring of Saturn is visible to us and the
other outer planets like Uranus ring's is
invisible to us? |
|320: ||What would happen if the sun exploded? |
|321: ||Are there stars bigger than the sun?
|322: ||How do astronomers predict eclipses?
|323: ||Do all the planets take the same time to revolve
around the sun? |
|324: ||Without any example, could you tell me how do
scientists measure gravity? |
|325: ||Is there air on any other galaxy?
|326: ||Can we see Saturn from Earth with naked eye? |
|327: ||How was the sun formed? |
|328: ||What is the safest place to be if a supernova occurs? |
|329: ||Is Venus hotter than Mercury because it is full of
carbon dioxide or because it does not have an
|330: ||Scientists claim to be true that GRAVITY IS THE
WEAKEST OF ALL THE 4 FUNDAMENTAL FORCES OF NATURE!
Now here's my question:
Being the weakest of all the 4 fundamental forces
of nature, why is it that the gravity of black
holes can bend even space, time and light? If it
is true that gravity is the weakest force, then
the black holes are violating the laws of
classical mechanics! Is it correct to say that
gravity is the weakest force?
|331: ||Why the universe has not end and why is it too big? |
|332: ||Does the sun have an explosion every day?
|333: ||How many stars are there?
|334: ||How big is the sun? How big is the earth? How big
is Jupiter? Can you compare them? |
|335: ||Hello, I am in 7th grade and was in Science class
while thinking, Man to Mars communication. My
question would be, while Man is on Mars will they
be able to communicate back to family and friends?
I know they will be able to back to the Space
Station but I was curious about the family and
friends part. If so, will this be freely chosen
times to talk or schedule time?
|336: ||I'm doing a project for school. I was wondering if
you could answer a few questions I have about
stars. Why are there stars out at night? Do we use
them as like night lights? Where do they go during
the day? If we didn't have stars, would it change
our daily life? |
|337: ||What would happen if the sun and moon collided? |
|338: ||Are stars useful why/why not? |
|339: ||Is there some other planet with an atmosphere that
we can breathe?
|340: ||How fast do meteors travel? How far is Mars from
Earth, and how fast can we get there?
|341: || What is the closest planet to Saturn and how far
away is it?
|342: ||Why isn't Pluto a planet anymore for a fact I am
|343: ||Why can't we feel the Earth move? |
|344: ||How long does it take for Mercury to make one full
|345: ||Does space have a floor or is it just like an
endless pit? If it does have a floor then, what is it? |
|346: ||How many asteroids are in the Solar System? |
|347: ||Theoretically asking, what would happen if the sun
were just removed? Not explode, just completely
vanish. Would each planet continue a tangential
orbit and become like meteors or would they change
their orbits to Jupiter, knowing it has great
mass. My physics class is presently talking about
this sort of subject and it interest me quite a bit.
|348: ||Why is there a storm in Jupiter? |
|349: ||How many volcanoes are in Mercury? |
|350: ||It seems that the universe was created by a big
perfect explosion, it is also expanding in harmony
to the point that it has created galaxies where
billions of stars were formed. It also seems that
stars created their own planets becoming solar
systems. It seems that our solar system has been
shaped with the right conditions in order for
earth to become a green house and support life in
many ways. Our plants, animals and us as a species
are structured with DNA coding. Our universe is
full of constants such as gravity, and speed. My
question based on my observation is the following:
Is the universe a computer program due to the fact
that there are not coincidences other than cause
|351: ||Including its rings which planet is bigger Jupiter
or Saturn? |
|352: ||Why does Earth have a moon and not Venus or Mars?
And why Saturn has rings and not the inner
|353: ||Why we cannot go to different galaxies? |
|354: ||What is the hottest star? Is there a hottest star
in the universe or when a new one is born will it
become the hottest star? |
|355: ||Why are there only 8 planets in the solar system?
|356: ||What would happen if the earth did not have the
sun....or the moon?
|357: ||Why isn't Pluto a planet? I think that it was a
star but people think that it was a planet and
that you guys saw a real planet, is it true or no?
I am not in school summer break. |
|358: || I've been researching, and Venus seems AWFUL. Is
there anything good About Venus? |
|359: ||When is that space dust and gases become a star? |
|360: ||Was Jupiter ever a solid planet?
|361: ||Can a black hole die?
|362: ||How are black holes made? |
|363: ||Does Jupiter have a solid core?
|364: || What happens when the sun dies? |
|365: ||If the supplies don't make it to Mars what would
happen if the people get there and the supplies
don't make it? What would the people do and why is
it a one way trip? |
|366: || How deadly is Mars? |
|367: || Is it a good idea to send people to Mars? |
|368: ||Why would people want to live on Mars? |
|369: ||Why don't comets hit Earth? |
|370: ||Where is the sun located in the Solar System? |
|371: ||Of the four main elements that make up life on
earth, are they present on other planets? |
|372: ||How does the force of gravity exerted by the Sun
on Jupiter compare to the force of gravity exerted
by Jupiter on the Sun? |
|373: || I want to know about NASA. Can you tell me about it? |
|374: ||Does one of the gas giants have any destroyed moons? |
|375: ||Are there new planets out there but people don't
discover them? I just wonder whats out there.
|376: ||Why is Pluto so small? |
|377: || What is the Milky Way? |
|378: ||If a cloud of hydrogen and helium were squeezed
together until it heated to a temperature of about
10 million °C, what would happened? |
|379: ||Where did the moon come from? |
|380: ||Why does craters disappear on gaseous planets? |
|381: || Why does the moon have the most craters? |
|382: ||What would happen if the universe exploded?
|383: || I have recently found a bit of information on the
Horse head Nebula. I was wondering if you know of
any credible sources I could use. |
|384: || How are solar flares related to the magnetic plea
on Earth? How do they work?
|385: ||To my understanding, General Relativity allows
matter to bends space-time with it's density and
collection of mass. If this is the reason as to
why planets orbit around stars, why don't they
lose energy and fall into the strongest density
point? Is there a force that prevents orbiting
objects from oscillating inward, or are they
already doing it at a incredibly slow rate? |
|386: ||Why should we explore Saturn?
|387: ||Why does it happen an eclipse between the moon and
the sun? |
|388: ||Why do astronomers use astronomical units to
measure distances in our solar system?
|389: || Which planet is lighter, Saturn or Neptune? |
|390: || Is every star a planet?
|391: ||Has the Mars Rover find life on Mars? |
|392: || Is Pluto made of gas or a solid? |
|393: ||Are black holes an illusion? |
|394: ||What filled in the impact craters on the moon and
|395: ||If Earth were to lose its magnetic field, how fast
would the atmosphere leak into space? Will it take
days, months, years for the gasses to be blown
away by the solar winds?
|396: || How did the sun form? |
|397: ||Why is the sun growing? |
|398: ||How long does it take to get to Titan from Earth
in a rocket that's going 2,500 miles per hour? |
|399: || Hello,
I was reading the Q&A about how gold was formed.
It seems there are "theories" of gold being formed
in a supernova explosion. Is this theory or fact?
|400: || After the Big Bang, they say the Universe
expanded (inflation) and cooled. Isn't heat the
energy that makes molecules move faster? How can a
universe "cool" if it's not made up of atoms? Can
energy "cool"? As the universe cooled, did energy
convert into more Hydrogen gas or did all the
Hydrogen in the Universe get created from the
start? When the energy of the Big Bang "cooled",
did it coalesce into matter? |
|401: ||Why was the Big Bang? |
|402: ||About how much oxygen will be needed as a fuel in
order to get to Jupiter or Pluto ? |
|403: ||How do stars ignite? |
|404: ||Is there any life outside our solar system? How
will we know? When will we be able to know? |
|405: ||Is the universe endless? And if it isn't how big
is it and is it just a big wall or like a planet?
|406: ||Does science have an estimate on the size of Outer
Space, and if so how far? |
|407: ||Why does the moon change shapes? |
|408: ||How was everything on Earth created form two
asteroids "hitting" each other? |
|409: ||Does space ever end? |
|410: ||What keeps earth from falling into the sun? |
|411: ||What factors keep a planet in orbit around the sun? |
|412: ||Are there other planets in space, other than the
ones we know? |
|413: ||Can matter be created or destroyed when a chemical
change occurs? |
|414: ||What are the three reasons Pluto is no longer
considered a planet?
|415: || If the universe is in a constant quest to reach
an equilibrium, and lets say it finally does reach
this point, what will happen? |
|416: ||Is there really two suns being discovered around
planet Earth? If so where are they siting? Please
send pics or video links. Thank you!
|417: ||Are the ocean tides and waves connected to the
planets and stars? |
|418: ||What is the average radius of the sun, in meters? |
|419: ||What is the hottest star within 20 light years of
|420: ||Is there comets or asteroids we don't know about
that could be on a collision course with Earth?
If so do we have a plan to divert them? |
|421: ||Can a spaceship land on Jupiter? |
|422: || How many days (not years) would it take to get to
|423: ||Where does the wind come from on Mars? |
|424: ||Why do different colors of light have different
energy levels? |
|425: ||Will the stars appear very bright in new moon day?
Or full moon day? |
|426: ||How wide is Mars? |
|427: ||Is there any planet in the universe that is bigger
than the sun?
|428: ||How were the galaxies and space created? |
|429: || Is it possible to make a black hole stretch and
if so how? |
|430: ||Why are there stars that are bigger the the sun? |
|431: ||If we would be able to cool Venus down and make
it habitable, how would we benefit from it? |
|432: ||Does the sun explode? |
|433: || How does the sun's gravity affect the other
planet's orbit? |
|434: ||What would happen if there was no sun in the
universe, not even stars? |
|435: ||How far is the sun? |
|436: ||Why does big planets have rings and small ones don't? |
|437: ||How is the rotation of Jupiter? |
|438: ||What happens to the dust that is part of the
molecules that form a star? |
|439: ||Do you think that if we move to Mars and don't get
swallowed up by the sun, then we could move to
another galaxy by the time the sun completely
|440: ||There are 2 suns, both following a parallel path
through the universe at the exact same distance
apart, both of these stars are equal in mass to
the size of Earth's sun. A planet with equal mass
to Earth orbits both suns. How would I determine
the eccentricity, speed, and habitable zone of the
orbit? If the planet sits at a similar axial tilt
to Earth, and spins at the same speed, would the
two stars make a difference to the
ecology/climate/length of days on the planet?
|441: || What evidence is there that proves the age of the
|442: ||How do scientists predict when a solar eclipse is
|443: ||Why does humanity focus and research space more
than the ocean? |
|444: ||How are stars, planets, moons, and nebula made? |
|445: ||Why are there black holes in space? |
|446: ||How does gravity work? |
|447: ||What is the universe expanding into? And whatever
it is expanding into, does it go on forever? |
|448: ||Do you think that in the future we would possibly
find a planet like Earth and live on it? |
|449: ||Is our sun stationary in space? |
|450: || I wonder how the solar eclipse started. |
|451: ||Will there ever be a way to create wormholes to
different planets or places? |
|452: ||How does the eclipse happen? |
|453: ||Why is measuring and finding the volume or mass of
something important to Science? |
|454: ||What would happen if the earth's axis spun the
opposite way? |
|455: ||How are planets discovered? |
|456: || Is it possible to create a working star destroyer
in real life? |
|457: || Will there ever be a time in the future where the
sun will be harmful to humans, and if so, when
will it be?
|458: || Why/how do stars explode? |
|459: ||If the sun blew up, would there be any way to know
before our demise? (As in like a final 5 minutes
before everyone dies.)
|460: ||When will Jupiter's gravity pull us closer to
outer space? Please answer back this question is
important for the jeopardy of the world
civilization. I am 12 years old. |
|461: ||Hi my name is Damien and I wanted to ask: how
long until the Earth is gone? The moon is moving 2
centimeters a year and eventually it will probably
hit a planet and then that planet would explode
and I want to know how long it will take. Thank
you for listening and I hope you can answer this
|462: ||What kind of heat do white stars emit and how hot
are they? |
|463: ||Why is there zero degree (temperature) in space? |
|464: ||Does the moon have more gravity than Earth because
it has no atmosphere?
|465: || What is the universe made of? |
|466: ||How does the eclipse affect someone's pregnancy? |
|467: ||What are the names of the planets?
|468: ||Why do some planets have no moons like Mercury and
Venus, and other planets have many moons like Jupiter? |
|469: ||Could it be that the white hole will never be
physical found in this universe,since this
universe is already occupied after big bang? Is it
possible that the business end of a black hole can
only establish a big bang where there is void? |
|470: ||What are asteroids? How did asteroids make earth? |
|471: ||If a planet in the universe breaks out of gravity
and collides with another, will it affect Earth? |
|472: ||What are the main types of galaxies? |
|473: || Why is the solar system flat?
|474: ||How will the sun explode some day? |
|475: ||I'm good at fiction, not at science. My question
is for an English project. My question is: 1
(one) Earth hour is equal to how many hours on
|476: ||Since the sun is white does that make it every
color or no color? |
|477: ||How many dwarf planets are in the galaxy? |
478 questions in the Category: astronomy.
|478: ||In Jupiter, the hydrogen in the atmosphere is in
the gas phase. As you go towards the center of
Jupiter, the hydrogen undergoes a phase transition
to the liquid phase. Why does this happen? |
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