Watch the breathtaking aurora video captured by NASA astronaut Don Pettit from the International Space Station, showcasing ...

NASA astronaut Sunita Williams is gearing up for her second spacewalk in a fortnight. The extravehicular activity (EVA) will take place on tomorrow (January 30), and will last for about 6.5 hours.

And though weightlessness allows astronauts to spin, rotate, and float through the air, it has a downside. Without the force of gravity to fight against, muscles of the body begin to deteriorate ...