We always see the same face of the moon, because?
Correct answer: C. It takes equal time for revolution around the earth and rotation on its own axis
- 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
- D. It rotates at the same speed as the earth around the sun
Explanation
The Moon rotates once on its axis in about the same time that it revolves once around Earth, about 27.3 days. This synchronous rotation keeps the same lunar hemisphere facing us.
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Astronomy covers the structure and motions of the solar system, planets, satellites, comets, asteroids and meteoroids, together with gravity, eclipses, seasons and phases of the Moon. It also introduces stars, galaxies, nebulae, black holes, space telescopes and satellites, while distinguishing rotation from revolution and meteors from meteorites.
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