Re: Trouble Forming Earthlike Planets
I'm no expert, Mark, but seems to me that all planetary systems found so far are unique. They have their own history and were given only so much matter, etc., to work with. Time, of course, plays a role too.
Have you seen this one:
Strange Object Found, Defying Ideas of Solar System Formation.
["This finding suggests that a diversity of processes act to populate the outer regions of other solar systems," said Michael Liu, a University of Hawaii astronomer who led the team that made the discovery.]
That's for sure!
Marcia