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Google has photographed the world in impressive detail and Google Earth includes a flight
simulator component.  

Google mapped the entire Earth with satellite photos, accurate terrain data, and even the 3D
likenesses of individual buildings in their correct locations.  The flight simulator option allows you to
fly over this world in a small airplane or a jet.  You can even fly under the water to explore Google's
underwater terrain mapping.  After you finish exploring the Earth, you can also fly on the Moon and
Mars.