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The large dark areas on the moon are called maria (seas) and were formed 4 billion years ago by upwelling of basaltic magma. The craters have been formed by impacts from solar system debris, mostly in the early years of our solar system. The moon is thought to have been formed out of the molten Earth by a grazing impact of a planetoid. The moon has lost most of its heat and is considered to be geologically inactive at present. The moon has almost no atmosphere and is open to bombardment by solar winds and cosmic rays.
Image and text copyright © Matt BenDaniel. All rights reserved. |
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