WorldWide Telescope

WorldWide Telescope is a virtual telescope created by Microsoft that includes terabytes of images from the Hubble Space Telescope, NASA's Spitzer Space Telescope, the Chandra X-Ray Observatory Center, and other famed ground and space-based telescopes and combining it with 3D navigation. It lets users explore the universe, take guided tours of the sky by astronomers and educators from famous observatories and planetariums, as well as create own tours to share with others.