Question

A star switches from a main sequence star to a red giant star when runs out and stops.​

Answer 1

But once the core runs out of hydrogen, the star starts to contract again briefly, until a shell of hydrogen around the core becomes hot enough to fuse into helium. When this happens, the radiation pushes the outer layers of the star far out into space, turning the star into a red giant

Step-by-step explanation:

Correct?