Sound needs something to travel through, like air. In space, there’s almost nothing, just a big empty vacuum. So when astronauts talk in space, their voices don’t go very far because they have no air to help them travel. But if they use a radio or a helmet, the sound can still be heard!
Examples
- A dog barking in the park can be heard from far away because the air carries the sound to your ears.
- If you blow up a balloon and let it go, the air inside moves out and makes a whooshing noise, that’s how sound travels through air.
- In space, if two astronauts are floating next to each other, they have to use radios or helmets to hear each other because there's no air.
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See also
- Why Can't We Hear Sounds in Space?
- What Causes the ‘Sound’ of a Bell?
- What Causes ‘Sound’ and Why Do We Hear It Differently in Different Places?
- How Does Sound Travel Through the Ocean?
- What Causes the ‘Sound’ of a Thunderclap and How Is It Different from Lightning?
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