The Impossibly Habitable Planet
Athletes sometimes speak of "being in the zone," a mental state that makes physical exploits seem effortless to them, as they achieve personal bests. Planets too, must be "in the zone," in fact, in eight of them, if they hope to have any chance at the elusive prize: sustaining life.
It's All About Zoning
Two astrobiology research teams recently calculated that the number of habitable planets in the Milky Way Galaxy...