Here are some amazing images that are literally out of this world. With views of 100 million stars and 200 million galaxies, Google Sky lets you be a virtual space traveller with just a few clicks of a mouse.
16. Constellation clues
Ever mix up Orion's belt with Leo's tail? Google Sky gives you a guide to the 88 constellations visible from Earth. To find out what constellations are visible in the night sky above you, first use Google Earth to find your house. Zoom in, and then switch to Google Sky. This gives you a rough idea of what your night sky looks like. Unfortunately, Google Sky doesn't factor in the time of year yet.