Stellarium

As I was reading about all the discoveries of Galileo while he was studying the sky with his telescope, I was reminded of a program that I had on my computer that is pretty much one of the coolest things ever. It is like your own personal mini planetarium. Here is a link for it http://www.stellarium.org/. You can download it for free and then look at all of Galileo's discoveries for yourself. I hope you enjoy.