Google Sky

Google Earth isn't Earth-bound any more. The latest version of Google Earth (new download required) includes a feature called Sky, which includes high-resolution images of hundreds of millions of stars from more than 200 million galaxies. The images are gathered from a variety of giant telescopes, including the Hubble Space Telescope.

To switch to Sky mode in Google Earth, click the planet icon on the toolbar. Alternately, pull down the View menu and select Switch to Sky. Click on any point in the sky to zoom into a closer image, and to display information about that star, planet, or galaxy.