WorldWide Telescope

From the WWT website from which the program can be downloaded or run on the web: 

"From web to desktop to full dome planetarium, WorldWide Telescope (WWT) enables you to explore the universe, bringing together imagery from the best ground and space-based telescopes in the world and combining it with 3D navigation. Experience narrated guided tours from astronomers and educators featuring interesting places  Read more about WorldWide Telescope