"Did you hear that whistling sound too?" "Sounds like -- you know, outer-space type music." "I wonder what it is." The above conversation between Apollo 10 astronauts Eugene Cernan and John Young, as their craft flew around the far side of the moon remained under wraps for over four decades.

NASA astronauts have eaten food grown in space for the first time in history, reports Vox.com.

As the NASA designs a fitness program for astronauts whose goal is to combat space's toll on the body, their discoveries could help keep us Earthlings in shape.