How long does it take for the moon to orbit the earth once?
Correct answer: B. 27.3 days
- A. 26.3 days
- B. 27.3 days
- C. 28.3 days
- D. 30.3 days
Explanation
The Moon takes about 27.3 days to complete one orbit relative to the stars, called its sidereal period. Its cycle from one new moon to the next is longer, about 29.5 days, because Earth is also moving around the Sun.
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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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