Space Engine download

A free space simulation software that lets you explore the universe
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Alternative software

Universe Sandbox
Universe Sandbox
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Simulate celestial bodies with real-time gravity, climate, collision, & physics.

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Galaxy 3D Space Tour screensaver
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GMAT
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You can model, optimize and estimate spacecraft trajectories.

Space Fantasies Free Screensaver
Space Fantasies Free Screensaver
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A free screensaver featuring excellent space-themed images.

the Engine Expert
the Engine Expert
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Loads the data and provides the necessary analysis.