You'd think that soaring around Earth on the International Space Station would be pretty quiet, but it turns out life aboard humanity's orbital outpost is surprisingly noisy — albeit in that comforting, white-noise sort of way. This, straight from commander Chris Hadfield's twitter, is a recording taken from inside the U.S. lab of the ISS:
Hadfield describes the ambient noise as being "somewhat noisy," but that "the sounds are of the environment that keeps us alive. Perhaps like in the womb :)"
For peaceful silence, says Hadfield, astronauts need only take themselves outside the ISS:
"Spacewalks are whisper-quiet, just radio comm and your own breath."