Celestia
Real-time 3D visualization of space.
Celestia is a free, open-source space simulation application that provides real-time 3D visualization of the universe. It allows users to explore over 100,000 stars, galaxies, planets, moons, asteroids, comets, and spacecraft. The software features seamless movement, exponential zoom, accurate real-time calculation of solar system object positions, and a planetarium mode. Users can expand the database with add-ons or create their own celestial objects. It is available on Windows, Linux, macOS, iOS, and Android.
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