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originally posted by: ManyMasks
a reply to: DeathSlayer
I had a nightmare couple of nights ago and I woke up, wasn't afraid more annoyed that I didn't kick ass in my dream but here's the funny bit, there was birds whistling outside and that never happens at night time and I wondered if those pesky birds whistling vibrations were the ones 5hat made me have the bad dream, anyway went back to sleep continued the dream and It was a bit better.
PhD student in Astrophysics, studying shock waves in space
Answered Apr 11, 2016
Space isn't a vacuum, as far as sound waves are concerned! Sound waves can travel through space the same way they do in earth's atmosphere: pressure waves.
When we look around, we see plenty of sound waves in low density, interstellar gas . There are some limitations when working with low densities and pressures (you have to look at length scales larger than an AU and time scales longer than a million years , so you can't bring your boombox into space), but there's a huge difference between almost a vacuum and truly a vacuum.