Moon Is Born

Pieces collide and form a single large body, the young Moon, which sweeps up remaining material.

surface of the moon

About 4 billion years ago the young Moon was bombarded by asteroids, and craters formed all over its surface. The impact of the rocks also pushed up mountains. In time, lava seeped from inside the Moon

through surface cracks and flooded the large craters. Geological activity has long ceased and, with no erosion from wind or water, the landscape has barely changed in 2 billion years. Today the Moon is a dead world covered by a porous blanket of rubble. Micrometeorites still bombard it; astronaut footprints will eventually be erased.

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