After 5 billon years the sun became a red giant that saturn jupiter uranus neptune survive but mercury venus earth mars are gone because the sun became bigger into it eat on our layer earth so it will still get bigger but we don't know what year it be but it can be a white star in a new life and is still a little small and our earth has no life that year and Thea attack earth in that year so Thea became the Luna or The Moon. [If this helps please reply or react my comment bye!]