"Hydrogen is in abundance around the sun but not around earth". Explain.

Explain why hydrogen is found in abundance around the sun while it is absent from the earth's atmosphere? Why there is no atmosphere on the moon?

The motion of earth around the sun is-

Assume earth is rotating around sun in circular path. Does sun do any work on earth? explain.

Earth completes one orbit around the sun is

Earth completes one orbit around the sun is

Explain the motion of a planet around the sun in a circular path?

Who explain the motion of planets around the sun?