Ever wonder what a blackhole sounds like? The sun? Remnants of the Big Bang? Yeah, neither had we but it turns out the answer is wind crossed with radio waves, an electronic heartbeat and the ocean. How? SpaceSounds has collected a handful of radio telescope recordings of pulsars, planets and machines (check out the oddly-addictive beeps of Sputnik). There are also human voices in the mix: Kennedy gives his "Man on the Moon" speech, ground control and the Apollo spacecraft communicate, a ground operator highlights technical issues Skylab 1 experiences during liftoff.
If written description isn't hacking it, listen for yourself at spacesounds.com
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.