Life on the moon
Wednesday, January 28th, 2009Isaac Asimov in his Foundation series postulated a Universe, or at least a galaxy, that had human beings as its only sentients. The time travelers portrayed in the End of Eternity swept all those bad aliens from near space and left mankind in charge of its own destiny. At the end of the series a search is made for the planet of origin, its solar system characterized by an E-type planet with a large moon and a ringed gas giant. Quite a series from quite an author.
In order to have life forms at all, it may be that E-type planets need large moons to generate tides, since these in turn keep the ocean in movement, stirring the pot if you will, so that a chemical mix of nutrients and proteins can spawn life. Mars, for example, may never have had a chance. In addition to its smaller gravity, Deimos and Phobos would cause imperceptible tides in a Martian ocean. As we probe further into space with new telescopes, new techniques, and new software, discovering more and more planetary systems, we may find other E-type planets, but we probably won’t be able to see their moons, so the large moon criterion, if it is a criterion, cannot be tested.
