Anybody aware of studies that compute the approximate mass of all the asteroids in the belt together?
nevermind, google has it.
Yes but I don’t remember where I saw it perhaps 50 years ago or so. Very large planet as a remember.
Then there was Tom Van Flandern who posited there were originally 2 large planets which broke up somehow. As I recall, he did this by computing long and short period comet orbits to find their origins - there was a lot more I just don’t remember it.
https://en.wikipedia.org/wiki/Tom_Van_Flandern