The New Life One, Earth's Orbit, and Aliens

We have three pretty interesting questions from listeners, both young and old. And they have to do with earth's orbit, about the growing sun and also about alien technology. The first question we have is from scott, who has a question about the earth's orbit. Why are planets not pushed away from stars? We're all engineers in our hearts. Engineers are trying to make things better. Physicists are doing the reverse. Man, e's always a dark side. Haven't you watched enough science fiction to know that? I thought starwars was fantasy. There's no dragons in it.