Why does the moon increase and decrease?

This is because the part of the moon that is irradiated by the sun is bright, and the part that is not irradiated is dark. Although the moon is a hemisphere every time it is illuminated by the sun, because the positions of the sun, the earth and the moon change every day, sometimes the moon faces the earth with its completely bright side, and sometimes it faces the earth with its side. In this way, the moon shows the change of profit and loss.

Another main feature of the moon's surface is that some young craters often have beautiful "radiation patterns", which are bright belts extending in all directions with craters as radiation points, and they almost pass through mountains, the moon sea and craters in a straight line.

Extended data

There are dark parts and bright parts on the surface of the moon, the bright part is highland, and the dark part is low-lying areas such as plains or basins, which are called the moon land and the moon sea respectively. When early astronomers observed the moon, they thought that the dark area was covered by seawater, so they called it "sea". The more famous ones are the sea of clouds, the wet sea and the sea of tranquility.

The bright part is the mountain range, where the mountains are stacked and criss-crossed, dotted with craters, that is, impact craters, which are a low-lying shape of annular uplift. There are more than 33,000 impact craters with a diameter greater than 1000 meters on the moon. Bailey Crater is located near the South Pole, with a diameter of 295 kilometers, which can accommodate the whole Hainan Island.

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