It used to be a considered theory within mainstream geology but the ridiculous pangae theory "won" and since then mainstream science accepts that as fact and it the basis for a lot of their positions.

When you look at the evidence the growing planet theory is the obvious truth. How else can we explain difference size planets, moons or suns? Obviously they don't just appear out of no where.

Neal Adams the comic who has now died, he made the suggestion that the reason mainstream science doesn't want to admit that planets are growing and that the big bang is false is that it would upset the religious.

If you want more evidence, like lectures and videos, I can send them.