Hi All, Very new to this forum, and hoping for some assistance. I am in the planning stages for a science fiction sequence of books. I am not planning on writing true 'hard' sci-fi as unfortunately I do not have the knowledge base required, however I would like the world building in my novels to be theoretically possible. I am very taken with the idea of the 'super earth' I have read about the relatively recent discovery of Kepler-22b and it really sparked something inside me. The greatest problem I see straight at the outset is that Kepler is estimated to have a gravity 7 times that of Earth, obviously not the most hospitable of environments for Homo Sapien! To my understanding gravity is influenced by mass, density and speed. (please forgive my ignorance I am more a humanities kinda guy!) My question is what is the largest possible size planet you could have that has, say, a maximum of 1.3 times Earths' gravity, while still having enough density not to collapse into itself? I would be very interested to hear any other possible problems that could be foreseen with a 'super earth' type planet capable of supporting human life.