Question

why do stars give out heat and light?

Answer 1

Stars give out heat and light due to the following factors:

In the centre of the star, hydrogen atoms combine to form bigger helium atoms.

Continuous reaction results in a chain of events giving rise to nuclear fusion.

Thus large amount of heat and light are released by the stars.

Answer 2

Stars are huge spinning balls of hot luminous gases. In the centre of the stars, hydrogen atoms combine to form

helium atoms. During this process, huge amount of energy is released in the form of heat and light.