Watch and Explore Outer Space with Stellarium, Celestia, and Xplanet

"Ubuntu founder Mark Shuttleworth spent about $20 million to go into space, and he never got farther away from Earth than a few hundred miles. Using three free software programs, you can look at and virtually travel to places millions of miles away without leaving your GNU/Linux desktop or paying a dime.

"The GNU GPL covers all three programs, and most major distributions include all of them as packages..."

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