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Sound moves in waves that travel through the air, similar to the waves created by dropping a stone in a pool of water. When you speak or shout, your vocal chords vibrate. These vibrations go out in all directions through the air as waves. Air is made up of particles, and it's the movement of these particles that make the sound waves. A vibrating object, like your vocal chords, bumps the air particles next to it. They then bump the particles next to them, and so on. In outer space, there are no particles to bump into, so sounds can't travel. No particles means no vibrations, and no vibrations means no sound waves, which means no sounds. In movies and on TV, you'll sometimes see and hear things exploding in outer space -- alien spacecraft and things like that. The explosions can make the story more exciting, but in real life, you wouldn't be able to hear an explosion in outer space. |
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Professor Parsons |
