Microsoft Research WorldWide Telescope
WorldWide Telescope enables your computer to function as a virtual telescope, bringing together imagery from the best ground and space-based telescopes in the world. Experience narrated guided tours from astronomers and educators featuring interesting places in the sky. A web-based version of WorldWide Telescope is also now available. This version enables seamless, guided explorations of the universe from within a web browser on PC and Intel Mac OS X.
Windows users can install the desktop client or run the Web client; Mac OS X users have to use the Web client only. If Space fascinates you, you definitely want to check out WorldWide Telescope from Microsoft Research! It is sure to inspire and empower you to explore and understand the universe like never before! Microsoft Research and NASA have also now added Mars to WorldWide Telescope and Bing Maps.