[ Thanks to kiterunner for this link.
]
“Stellarium and Celestia 3D are two incredibly good
applications for aspiring star gazers. Stellarium renders 3D
photo-realistic skies in real-time while Celestia 3D is an awesome
3D astronomy program that allows users to display objects ranging
in scale from artificial satellites to entire galaxies in 3D.“Celestia is a free 3D astronomy program. Based on the Hipparcos
Catalogue, it allows users to display objects ranging in scale from
artificial satellites to entire galaxies in three dimensions.
Unlike most planetarium software, the user is free to travel about
the Universe.”