If man-made spaceships ever reach the moon, many space enthusiasts assume that they will find suitable landing gronds on the moon's vast, level plains. This assumptions is based on the view that the lunar plains, which are made of some darker material than the rest of the moon's surface, are actually lava beds poured out from once-active volcanoes whose craters now it the moon's surface. Recent observations, however, suggest that the moon has been a cold planet for so long that volcanic activity is not a satisfactory explanation of its topography. Instead, the belief...
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