Celestia

Celestia is a real-time 3D astronomy software program that was created in 2001 by Chris Laurel. The program allows users to virtually travel through our universe and explore real objects that have been catalogued. Celestia also doubles as a planetarium, but the user is not restricted to the Earth's surface, like in other planetarium software such as Stellarium. To summarize, Celestia is a scientifically accurate 3D universe simulator, that is also highly customizable. Celestia can display objects of various scales using OpenGL, and the user can seamlessly transition between different scales, from entire galaxies to spacecraft a few meters across. Celestia is available for AmigaOS 4, Linux, macOS, Microsoft Windows, iOS, and Android. It is free and open source software released under the GNU General Public License. Celestia's development stopped in 2013, with the final release in 2011.

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