CAC - Novedades |
| Posted: 10 Jan 2012 05:01 PM PST The distribution of these two surface types differs from one face of the Moon to the other. Whereas nearly one third of the near side of the Moon is covered by 'seas', these represent only 2% of the surface of the far side of the Moon. But how did these physical structures form? Approximately 3.8 billion years ago, the Moon's crust was heavily bombarded by asteroids, creating numerous impact craters with diameters hundreds of kilometres wide. These craters were subsequently filled by lava, forming oceans of molten rock. As they cooled, they formed the 'seas' that we see today. Craters account for the majority of the Moon's surface features. In fact, there are approximately 30,000 craters with a diameter greater than 1 kilometre on the near side of moon, and countless more that are smaller. |
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