How does sound work? DOes it require air or something similar to carry
the sound .... my question is in space, is there sound? Obviously the
astronauts speak to each other inside the shuttle, but there is air in
there... thanks

Hello.

There is no sound in space.


From Cornell University - Ask an Astronomer: 

"In empty space, there is no air, and what we call "sound" is actually
vibrations in the air. ...[T]here are indeed light waves and radio
waves in space, but these waves are not sound, but light. Light does
not need air to travel, but then you don't hear it; you see it, or it
is interpreted by your radio set and then translated into sound.
Astronauts in space do talk to each other. In the spacecraft, there is
plenty of air, so they just talk normally. When they are spacewalking,
they talk by means of radios in their helmets. The radio waves, again,
have no problem in space, but they're not sound. They're radio, which
has to be converted into sound by the astronauts' headsets."
Source:
"Can you hear sounds in space?"
http://curious.astro.cornell.edu/question.php?number=8


From NASA:

"Sound is also a type of wave that we cannot see. Like ocean waves,
sound waves need a medium to travel through. Sound can travel through
air because air is made of molecules. These molecules carry the sound
waves by bumping into each other, like Dominoes knocking each other
over. Sound can travel through anything made of molecules - even
water! There is no sound in space because there are no molecules there
to transmit the sound waves. "
http://imagers.gsfc.nasa.gov/ems/waves.html

Also see:
"How Does Sound Sound?"
http://starryskies.com/articles/dln/9-97/sound.html

----------
search strategy
"no sound in space " "sound waves"

I hope this helps.

Great, thanks!

There is sound in space!
Inside galaxies, there is always a very tiny amount of particles are
present in space, which can allow ultra low frequency waves to
propagate. That way it is possible to hear some "sounds" from drastic
galactival events with special instruments.