Martian Moon Blocks Sun
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Martian Moon Blocks Sun

January 4, 2005
This image shows Mars' moon Phobos partially blocking the Sun. It was taken by the Mars Exploration Rover Opportunity on the morning of the 45th martian day, or sol, of its mission. This observation will help refine our knowledge of the orbit and position of Phobos. Other spacecraft may be able to take better images of Phobos using this new information. This event is similar to solar eclipses seen on Earth when our Moon passes in front of the Sun.

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