Question

Stars release energy due to the ________ of hydrogen.

Answer 1

1. Stars are made up of mainly hydrogen gas.
2. Inside the core of the star, the nuclear reaction takes place due to tremendous pressure.
3. Inside the core of the star nuclei of hydrogen are fused (addition) together to form helium and a vast amount of energy is released.

Hence the right answer is Stars release energy due to the fusion of hydrogen.