Birch Planet
A birch planet is an artificial world which gravity comes from a black hole.There can be extremely big birch planets that can be as to a light-year in diameter using a black hole that surface gravity would be like on earth,but the black hole would need be 1.5 trillion heavier that our sun to do that.The conept is like a shellworld Shellworld,but using a black hole.Birch planets can have layer with diffrent gravities and time flows due to the gravity of an black hole.The biggest birch planet could have so many people as an kardashev 3 civilzation Kardashev scale. The name "Birch planet" was made by an american futurist/youtuber Isaac Arthur.
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