Question

There is no sound in the vaccuum of space. Why? Select all that apply

1: Sound Must travel through something that vibrates
2: There is no energy in space
3: There is no air to vibrate the human eardrum
4: Space is too full of light energy.

Answer 1

#1 and #3 are correct.

#3 is slightly goofy.
The problem is not that there's no air to vibrate your eardrum.
The problem with no air is that there's nothing to ever bring the sound
to your head, even if you're only a foot away from the source. There
are just NO SOUND WAVES going on at all.