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What is the main source of energy for stars - SS3 Physics Astrophysics And Cosmology II Question

What is the main source of energy for stars?

A

Nuclear fusion reactions that convert hydrogen into helium.

B

Gravitational energy released as the star contracts.

C

Energy from the accretion of gas and dust in the early stages of the star's formation.

D

Chemical reactions between different elements in the star.

correct option: a
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