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Mercury’s Shining Craters

The two craters at the bottom of the frame are located in Mercury’s giant Caloris Basin, a thousand mile wide depression formed billions of years ago when Mercury collided with a comet or asteroid. For scale, the larger of the two is about 40 miles wide. Both craters have dark rims or "halos" and the one on the left is partially filled with an unknown shiny material. Credit: NASA
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Published in researchmaterial Work

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