by wickedwillie on February 20th, 2005

wickedwillie

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What is the cause of the dark spots (maria) on the moon?

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  • by trashcity on February 23rd, 2005

    trashcity

    They are vast, ancient lava flows which welled up when a hole was punched through the crust around 3 billion years ago, by the impact of large meteorites. When they solidified, they formed the dark, smooth areas originally mistaken for lunar seas by some early astronomers.

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