Question

why we could observe only one side of moon​

Answer 1

Only one side of the Moon is visible from Earth because theMoon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as synchronous rotation, or tidal locking. The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases
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Answer 2

due to sun light reflects from the moon that's why we can able to see only 1 side of the moon