Question

1. Stars are very hot and bright , why?​

Answer 1

Some stars are much more powerful than others, emitting far more light. And the larger the star, the more square inches of surface, so the more total light it emits into space. ... A star that's the same temperature as the Sun but twice its diameter, for example, emits four times more light.

Explanation:

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Answer 2

Explanation:

Stars shine because they are extremely hot (which is why fire gives off light — because it is hot). The source of their energy is nuclear reactions going on deep inside the stars. In most stars, like our sun, hydrogen is being converted into helium, a process which gives off energy that heats the star.