Everyday Science
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Medium
Question
We always see the same face of the Moon because __________?
A
It is smaller than the earth
B
It revolves on its axis in a direction opposite to that of the earth
C
It takes equal time for revolution around the earth and rotation on its own axis
✓ Official correct answer
D
It rotates at the same speed as the earth around the sun
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
It is smaller than the earth
No member explanations yet for this option.
B
It revolves on its axis in a direction opposite to that of the earth
No member explanations yet for this option.
C
It takes equal time for revolution around the earth and rotation on its own axis
No member explanations yet for this option.
D
It rotates at the same speed as the earth around the sun
No member explanations yet for this option.
Explanation
The Moon is tidally locked: rotation period equals orbital period.
Hence the keyed answer is It takes equal time for revolution around the earth and rotation on its own axis.
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