The phases of moon

Do we know?. why does the moon changes its shape?

The moon, which causes high and low tides on the Earth, is a sphere. It does not changes its shape; only our view of it changes. The reason is that unlike the stars, the moon does not produce light, but only reflects the light of the sun. Since the moon goes around the Earth once in a month, the orientation of the moon, the sun, and the Earth respective to one another changes. For this reason, the illuminated part of the moon cannot always be seen clearly from the Earth. Sometimes we see it full, sometimes half, and sometimes not at all. The side of the moon that faces us remains the same. We can see the craters and dark spots on the moon, which are known as 'mares'.

We always see the same side of the moon.

It happens because of the moon rotates once on its axis during the time it complete one revolution around the Earth -which is 27 days, 7 hours, and 43 minutes. The mutual attraction between the Earth and the moon has tuned these two movements in this way. In fact,we did not know for a long time how the moon looked 'from behind'. In 1959, a Russian probe sent pictures of the unseen side of the moon to the Earth. The Apollo spaceship landed on the visible side of the moon because a radio connection cloud not be established with the other side.

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