Astronomy magazine podcast: Mercury revealed
Find out what MESSENGER discovered about the innermost planet.
July 3, 2008
July 4, 2008
Craters dot this part of Mercury, located on the side unseen by Mariner 10. A few craters show bright rays — a sign they are relatively young. Such rays fade away as exposure to tiny meteoroids and solar-wind particles darkens them.
Photo by NASA/JHUAPL/CIW
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