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Celestia, the free space simulation that lets you explore our universe in three dimensions. Celestia runs on Windows, Linux, and Mac OS X.

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A view of Earth from far out in space.

A closeup of the space shuttle Discovery in orbit over Florida; this shot demonstrates Celestia's virtual texture feature for extremely high resolution mapping of planets.

Looking down at Mars's tiny moon Phobos and the giant Valles Marineris rift valley.

The 1989 flyby of Neptune by Voyager 2--last stop before leaving the solar system.

Saturn and its rings. Dark shadows cast by the rings are visible in the top hemisphere of Saturn.

Jupiter and its large moon Europa. The surface of Europa is mostly water ice and full of cracks created by tidal stresses.

The recently discovered extrasolar planet Rho Cancri e, one of a system of at least four planets. Rho Cancri b is visible just to the right of e.

The orbits of a number of main belt asteroids (in brown) plotted togeter with major planet orbits (in blue).