Eh we would of been eaten by it by then and also we would of not been in the Goldilocks zone anymore

Yea

It would have to be a star like our sun or else mars would still be really cold or it would be so hot that it’s uninhabitable

... Well it turns into a small black hole and this other star explodes and becomes the new sun I think

But once the sun dies, it’ll turn to a black hole (I think) and swallow mars and the other planets.