In space, no one can hear you scream

It's not just a line from a horror film: in space, sound literally cannot travel.

Sound needs something that vibrates —air, water, a wall— to move from one place to another. Space is an almost perfect vacuum: there is practically nothing to vibrate. That's why an enormous stellar explosion would happen in absolute silence.

Light, on the other hand, does cross the vacuum. That's why we see the stars, but we will never hear them.