Hello, I'm currently very interested in making planets, putting a black hole in the core and diamond as the crust. When I added stuff, the planet started to look like a clown or mickey mouse, and I really don't like that. On the internet, there was some planet creator, and i wanted to try that in the Powder Toy.
As much fun as it would be for TPT to be Earth Editor-compatible, right now the particle movement algorithms prevent this from really working. It's perfectly possible to make a planet in TPT even in anti gravity mode when the code is changed, but things like water tend to move downwards even without it.