This is called 𝓸𝓻𝓫𝓲𝓽, ( or not ) An orbit will occur if a thing gets enough speed to orbit around an object, For example, The Theian collision caused the moon and a ring to form are the earth, since it has enough speed to orbit around it, the pieces started to collide because they have different speeds to orbit around the Earth

What...

P- perfect circle.?

Ratio: ?:?