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10 awe-inspiring images of the moon

By: Katherine Butler on July 13, 2011, 11:29 a.m.
the moon with a blue gradient background

Photo: NASA

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Moon aglow

This photo was taken by the Expedition 10 crew aboard the International Space Station. It shows a full moon against space. Most experts believe that the moon was created when a "rogue planet" the size of Mars collided with a young Earth. They believe a cloud of particles rose 13,700 miles into the upper atmosphere and reformed as the moon. This theory gains credence from lunar rock samples, which are shown to be 4.6 billion years old, the estimated age of the Earth. (We get to a few other theories later in this gallery.)