Question

The heavenly body which revolves around a planet is called a_________.
(A) comet
(B) star
(C) satellite
(D) nebulae

Answer 1

Hint
The heavenly body which revolves around a planet is due to the gravitational force of attraction between the planet and the heavenly body which is present in space. By finding out the above said reason, which body is revolving around the planet is determined.

Complete step by step solution
1. Comet:
A Comet is a celestial object which consists of a nucleus of ice and dust that orbit the sun. Comets are cosmic snowballs of frozen gases. Sometimes the comets are called dirty snowballs. They are a mixture of water and frozen gas. Comets are the primitive body which are left over from the formation of the solar system. So, the comets are not attracted by the gravitational force.
2. Star:
Stars are the most recognised astronomical object, and the stars are the most fundamental building block of the solar system. But a star is a luminous ball of gas, and it contains most of hydrogen and helium gas, both the gas is held together by its own gravity. Nuclear fusion reaction helps the stars to produce photons and heat, and this heat will glow like light. Star will also have some gravitational force but it is not attracted by the gravity of force.
3. Satellite:
A satellite is an artificial machine that revolves around the orbit of the planet. Usually, the satellite is launched for the planet to space and it revolves around the planet. A satellite is the self-contained communication system which has the ability to receive the signal from the planet and transmit the signal to the planet. And it revolves around the planet by the gravitational force of attraction between the planet and satellite.
4. Nebulae:
Nebulae is also like a comet, it is a cloud of gas or dust which presents the free space. The nebulae which come from the gas and dust thrown out by the explosion of some stars. And the nebulae are the dangerous gas sometimes. And it is not attracted by the gravitational force.
Thus, the satellite is the heavenly body which revolves around the planet.
Hence, the option (C) is correct.

Note
The satellite is the artificial machine which revolves around the planet. And the comets, stars and nebula are the astronomic element which travels in space. And these elements are having some gravitational force but it is not attracted by the planet.