Which one of the following statements about a satellite orbiting around the Earth is correct ........

General Science (NDA) Physics

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Which one of the following statements about a satellite orbiting around the Earth is correct?

Satellite is kept in orbit by remote control from ground station.

Satellite is kept in orbit by retro-rocket and solar energy keeps it moving around the Earth.

Satellite requires energy from solar panels and solid fuels for orbiting. .

Satellite does not require any energy for orbiting.

Explanation:

A satellite does not require any energy for orbiting in the absence of external factors like aerodynamic drag, magnetic gradient, etc. It only needs energy to reach to the orbit. Hence D is the correct answer.

In the context of spaceflight, a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such as Earth's Moon. On 4 October 1957 the Soviet Union launched the world's first artificial satellite, Sputnik 1.