Google unveiled a new addon for Google Earth called Google Sky, this piece of software allows you to explore the universe.
Switch your view to see the sky above your Earth location, and explore far-away galaxies, nebulae, and more. Zoom in to see imagery from the Hubble Space Telescope, learn about the lifecycle of a star, or even view the constellations. After all, the Earth doesn't sit in a vacuum... that would be an awful waste of space.
The tool is part of Google Earth 4.2 which can be downloaded over here.
If you're interested in this kind of stuff I also highly recommend a program called Stellarium. You have to enter your coordinates in this program and it will render a realistic sky in 3D, just like what you see with the naked eye.