Bok
09-08-2011, 06:57 PM
Some of the exoplanets appear to be denser than others
More... (http://www.sciencenews.org/view/generic/id/334232/title/Super-Earths_may_come_in_two_flavors_)
More... (http://www.sciencenews.org/view/generic/id/334232/title/Super-Earths_may_come_in_two_flavors_)