As Earth's closest neighbor and with an atmosphere more similar to Earth's than any other planet in the solar system, Mars has long been a subject of great interest to astronomers and the public. NASA began exploring Mars with unmanned spacecraft in the 1970s, and the space agency hopes to eventually send a human to the Red Planet. In March 2009, NASA and Microsoft partnered under a Space Act Agreement to make images of Mars and other planets available through Microsoft's WorldWide Telescope, an
A panoramic view of the surface of Mars taken by the Mars Exploration Rover Spirit during its mission to the planet.
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