well from my experience growing planets, producing the gravity is the hardest part. once you got enough density on your part, gravity takes over and sucks everything around you in, slowly forming more and more mass untill enough pressure builds to either cause a fusion reaction and form a star, or just to solidify in to a ball with a molten core..as i have only been growing mine for like 20 years, its only a few molecules big...but no really, in like 5 million years, shits ognna be so dank..ill smoke the hell out of it