Multiple choice

We always see the same face of the moon, because

  1. it is smaller than the earth

  2. it revolves on its axis in a direction opposite to that of the earth

  3. it takes equal time for revolution around the earth and rotation on its own axis

  4. it rotates at the same speed as the earth around the sun
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Moon's period of rotation on its own axis is equal to its period of revolution around the Earth, a phenomenon known as synchronous rotation. Because of this exact synchronization, the same side of the Moon always faces the Earth.

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