Celestia - Free Opensource Space Simulation to Explore the Universe
Sep 12, 2008, 06:02 (0 Talkback[s])
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"Celestia is used in homes, schools, museums and
planetariums around the world, it also is used as a visualization
tool by space mission designers. Celestia runs on Windows, Linux,
and Mac OS X. The latest stable version is 1.5.1."