YaleNews | A new Goldilocks for habitable planets
http://news.yale.edu/2016/08/19/new-goldilocks-habitable-planets
The search for habitable, alien worlds needs to make room for a second “Goldilocks,” according to a Yale University researcher.
A new study, appearing in the journal Science Advances on Aug. 19, suggests that simply being in the habitable zone isn’t sufficient
to support life. A planet also must start with an internal temperature that is just right.