Mercury's HorizonCredit: NASA/JHUAPL/CIWNASA's Messenger spacecraft acquired this image of Mercury's horizon as the spacecraft was moving northward along the first orbit during which MDIS camera instrument was activated, which occurred on March 29, 2011. Bright rays from Hokusai can be seen running north to south in the image. The right side of this image is about 750 miles (1,200 kilometers) in extent.
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