http://www.google.com/sky/You can tour on the Sky in different types of data:
- 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.
- Infrared - An infrared view of the sky from the Infrared Astronomical Satellite (IRAS). Change the transparency of this layer by moving the slide bar to blend the optical and infrared.
- Microwave - A view of the microwave sky from NASA's Wilkinson Microwave Anisotropy Probe (WMAP), which shows the universe as it was 380,000 years after the big bang.
- Historical - The sky as drawn by Giovanni Maria Cassini (printed in 1792) showing the constellations in their classical form from the collections of David Rumsey
Google Sky, Mars, and Moon