Question

What will be the reason for the revolving of the moon around the earth?
A. The large amount of electrostatic force exerted by the moon on earth
B. The small repulsive gravitational force which is exerted by the earth on the moon
C. A large amount of gravitational force exerted by the earth on the moon
D. All of these

Answer 1

Hint: The path of the Moon-earth system in its solar orbit is expressed as the movement of this both the center of gravity around the Sun. As a result of this, the center of earth suddenly changes direction inside and outside the solar orbital path at the time of each synodic month as the Moon moves in its orbit with respect to the common center of gravity. This will help you in answering this question.

Complete step-by-step solution
The moon is revolving around the earth due to the earth’s stronger gravity. Some astronomers assume that the moon and earth are a dual planet system. The plane of the orbit of the moon will be very close to the plane of the orbit of the earth around the sun. The moon always places its face towards the earth, but to the sun it will be having its own rotation. This is because we have the phases of the moon. The tides are also there which is due to the effect of the gravity of the moon on the earth.
Therefore the answer will be option C.

Note: The gravitational effect of the sun on the Moon is more than twice that of the earth on the Moon. As a result, the trajectory of the moon will always be convex as we can see when looking towards the sun at the entire Sun-Earth-Moon system from a large distance which is outside the Earth-Moon solar orbit. The trajectory is nowhere concave from the same perspective or looped. Therefore the region enclosed by the orbit of the moon of the Sun will be a convex set.