The extreme cold of space instantly absorbs all sound wave energy

In a zero-gravity environment, air molecules are incapable of vibrating

science

The tagline from the movie *Alien* — "In space, no one can hear you scream" — is scientifically accurate: sound travels perfectly well on Earth yet is completely inaudible in outer space.

Why?

The extreme cold of space instantly absorbs all sound wave energy
In a zero-gravity environment, air molecules are incapable of vibrating
There is no medium — such as air or water — to carry sound waves ✓

There is no medium — such as air or water — to carry sound waves
Sound travels through the sequential vibration of molecules in a medium. Outer space is nearly a perfect vacuum, meaning there is no medium at all — and without one, sound simply cannot exist.

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