And now, see what it was like to drive on the Moon

When it comes to cool road trips and awesome driving exploits, Apollo astronauts David Scott, John Young, and Eugene Cernan pretty much have us all beat forever, seeing as how they drove on the Moon and all. At least the video up top gives some idea of what it was like to tool around the Moon. » 2/03/13 10:00am 2/03/13 10:00am

In 1971, Apollo astronauts went to the moon to double check Galileo's…

The equivalence principle is one of the fundamental concepts behind gravitational theory and general relativity, and holds that gravity exerts the same force on objects of different mass. » 11/02/11 10:40am 11/02/11 10:40am