Convergence to panspermia

New discoveries in astronomy and biology continue to point to Panspermia as the most likely mode of the origin of life on Earth. This paper builds upon the work done by W.M. Napier, 2004 1 , and re-esti- mates the time for the seeding of the gal- axy given the latest 2013 estimates from the Kepler Mission data. We present this thought experiment in the form of an opin- ion paper. We calculate that, from a single point source of origin, the full colonisation of the entire Milky Way galaxy by primitive microbes will take place in a timescale less than the average age of low-mass stars in the galactic disc, 10 10 yr (i.e., 10 billion years ago; bya). Our calculation is independent of the location of the point-source. The writers believe the probability of the point-source being Earth is infinitesimal compared with it being elsewhere in the galaxy. intense comet and asteroid bombard- ment leads naturally to the hypothesis that the impacts themselves were re- sponsible for the start-up of life on the Earth 2 . The presence of amino acids and nucleobases in the Murchison meteorite has given credence to the more restricted hypothesis that these molecules served as the components of an Earth-based primordial soup from which life was able to originate