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464 questions in the Category: astronomy.

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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 planet?
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 through itself?
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 resources?
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 Earth?
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 cant 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 Earth?
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 gravity?
38: Is it possible that an animal could set foot on another planet?
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 how long?
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 planets?
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 very much!!!!
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 Jupiter?
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 Jupiter?
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 visited?
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 Cube?
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 common materials?
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 like raspberries?
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 earth.
150: Is there really life on Mars? What evidence is there that there may or may not have been life on Mars?
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 alive.
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 it?
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 on earth?
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 year- long "HHHHHHHHHH...eeeeeeeeee...lllllllllllllllll 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 side?
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 learning about.
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 universe?
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 answer me.
201: How do you know how many galaxies there are in the universe?
202: How did the carbon get in the universe to form the nebulas?
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 the past?
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 galaxies?
214: Can you hear a space ship in space or a super nova?
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 1042 kg.
Thanks

217: How does the lunar orbit compare to a circular path?
218: How do other planets affect Earth's gravitational pull?
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 once?
226: Why can't we see other stars or their solar systems/and how far are we from the other solar systems?
227: Have the planets ever lined up? If they have, what 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 why 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 space?
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 galaxies 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 planets?
252: How many stars are in the galaxy? Is it true that if you go into a black hole, you can still come out?
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? Thanks.
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 space?
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 float?
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 very much!
295: If a comet passes too close to Earth, what might happen?
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 around?
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? Thanks
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 atmosphere?
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? Thanks,
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 asking?
343: Why can't we feel the Earth move?
344: How long does it take for Mercury to make one full orbit?
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 and effect?
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 planets?
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 mercury?
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 Earth?
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 Jupiter?
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 explodes?
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 universe?
442: How do scientists predict when a solar eclipse is coming?
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 question.
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?
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