Is there sound in space?

Mostly no. Most of space is nearly a vacuum, so there is nothing for sound waves to travel through. The exception is thin gas in places like galaxy clusters: Chandra found real sound waves around the Perseus cluster's black hole, far too low for human ears.

What's actually true

Space is mostly silent, but not everywhere. Sound is a pressure wave, so it needs something to travel through. Most of space is close to a vacuum, which is why an astronaut couldn't hear an explosion outside the station. But galaxy clusters are wrapped in huge clouds of hot gas, and NASA's Chandra telescope found pressure waves rippling through the gas around a black hole in the Perseus cluster. They are real sound waves, just about 57 octaves too low to hear.

Takeaway: Mostly no, because space is nearly empty. Where there's enough gas, like around galaxy clusters, sound waves really travel.

Why people believe it

It's half true, which makes it stick. You really wouldn't hear anything in the near-vacuum between planets, and the film tagline 'In space no one can hear you scream' made that famous. What gets lost is that space isn't perfectly empty everywhere. Where gas is dense enough, pressure waves can move through it, and NASA's 'black hole sound' clips are those waves shifted up into our hearing range.

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