But Katz believes something may have changed ... dulling effect on the sound. The reverberation time – how long it takes for an acoustic signal to decay within a space – decreased by ...

Sounds can travel through water, solids, air or anything that has particles for the sound vibrations to bounce off. That's why there's no sound in space ... that molecules have in this process.

Why can't we hear this alien scream in space? And have you ever wondered, when you make a sound, like, ooooooooooooo, how does the sound actually get into your ears? Watch what happens when the ...