Answer 1:
Interesting question - that depends what you
mean by "hear." As you may know, what we
call "sound" are just vibrations around us;
these vibrations travel through the air to our
ears, making our eardrum vibrate, and causing us
to hear a sound. Now, what if there were no air
around? Well, without the air to vibrate,
there's no way for vibrations to travel from
whatever's making them to our ears, so we
wouldn't be able to hear anything! So, if you
were sitting in space without a helmet on (don't
try this!), you wouldn't be able to hear
anything. In order to communicate, astronauts
need to use radios mounted within their
helmets.
However, there's still something like sound
waves in space. For example, when a star dies,
it explodes (like in a super nova, as you
mention) or emits bursts of gas. Since
interstellar space ("interstellar" means the
space inside a galaxy) contains some small
amount of gas, it turns out that the explosions
from a dying star can cause ripples and shock
waves in the gas. These ripples are very
similar to our familiar sound waves in air,
except they're much, much bigger (so they're not
something we can "hear," though we can detect
them with telescopes).
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