In space, no one can hear you scream. You may have heard this saying. It’s the tagline from the famous 1979 science fiction movie “Alien.” It’s a scary thought, but is it true? The simple answer is ...

Sound needs a medium (solid, liquid, or gas) to travel. Space is a vacuum, lacking the matter to carry sound waves. No sound in space means no echoes. While a near-perfect vacuum, some sounds can be ...

Space isn’t completely silent. In clusters of galaxies, astronomers have recorded deep sound waves—haunting tones that travel through the vast clouds of gas. Secret Service finds 17 'skimming' devices ...