posted on Jun, 16 2008 @ 01:09 PM
Interesting. Not sure what they mean by 'super-Earths, unless it's the size:
The planets are bigger than Earth -- one is 4.2 times the mass, one is 6.7 times and the third is 9.4 times.
One thing to keep in mind is the kind of gravity you'd probably find on such a planet, given that the density is similar to Earth's.
I'd think such planets would only have life in the oceans other than simple microscopic land forms, because their gravity would be quite high.
I think it illustrates that the kind of planet and the location in the galaxy would be quite narrow to allow the development of sentient life. Still,
there could be plenty of life on other planets in our galaxy, and sentient life might also be prevalent. It just requires a special set of
circumstances for that life to be able to get off planet and then to become space-faring, let alone develop sigificant space exploration skills.
Any such civilization would have to be, imo, truly extraordinary, occupying a Goldilocks
of low radiation and only limited planetay extinction events. (enough to drive evolution and no more).