Google Sky includes a number of different ways to explore the universe. The initial view shows the visible universe and is a mosaic of images from the Sloan Digital Sky Survey, the Digitized Sky Survey and the Hubble Space Telescope. Images can be seen in x-ray, ultraviolet, infrared, microwave and historical views. You can find the positions of the planets and constellations on the sky and even watching the birth of distant galaxies as seen by the Hubble Space Telescope.