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Stellarium - Stellarium is a free open source planetarium for your computer.
Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.
Mitaka - Mitaka is software for visualizing the known Universe with up-to-date observational data and...
Celestia - Real-time 3D visualization of space
WorldWide Telescope - The WorldWide Telescope (WWT) is a Web 2.
Cosmographia - This is an app that will let you explore the Solar System!