Question

The main source of energy of sun and the stars is

• A. combustion
• B. Gravitational contraction
• C. Nuclear fission
• D. Nuclear fusion

Answer 1

The correct option is D Nuclear fusion

The main source of energy of sun and the stars is nuclear fusion.

Nuclear fusion is the process of formation of a heavier nuclei by combination of two lighter nuclei.

In the sun, Hydrogen nuclei combine to form a helium nucleus.

Hence, option $\left(D\right)$ is correct.