Celestia
Celestia is an
open source, 3D
astronomy program for
Windows,
Mac OS X, and
Linux created by Chris Laurel. The program allows user to simulate objects ranging in scale from the
International Space Station to the
Milky Way Galaxy in three dimensions using
OpenGL. Unlike most
planetarium software, the user is free to travel about the Universe. Over 1GB of add-on content is available to supplement the basic program as a result of the small, but productive community of users that support the program.
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