Question

Why do we see only one side of the moon​

Answer 1

Answer:

We see only one side of the moon because it's relative speed(Difference of speeds of it's rotation and revolution round the Earth.)is 0, since it's period of rotation is equal to it's period of revolution round the Earth.

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Answer 2

Answer:

Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as  tidal locking. The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases.