It’s a free space simulation program that lets you explore our
universe in three dimensions. Celestia runs on Windows, Linux, and
Mac OS X. Unlike most planetarium software, Celestia doesn’t
confine you to the surface of the Earth. You can travel throughout
the solar system, to any of over 100,000 stars, or even beyond the
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Date Published: Aug 26, 2009 - 4:50 pm