Super Thanks!
Eventually when you raise the planets temperature and it's in the green zone, then it will progress to child and so on. I think we all agree on the zoom being a touch slow too! We honestly appreciate the play and comments. TY!
just to add: you can click the planet more then once to speed it up.
As for progressing: once you get to child stage you need to "feed" the planets asteroids to give them metal and uranium. Hope that helps!