I'm not a scientist, but I found this disappointing. It seems a tad obvious to say the least, and contains some sloppy thinking. The very first 'conjecture', that life may be found on planets orbitting other stars within the next hundred years or so, blatantly ignores the recently discovered subsurface oceans on moons in our own solar system - which may well harbour aquatic life-forms, even if microbial. Then there is the presumptuous leap which implies intelligent design (in the act of deliberate seeding), which could be allegedly deduced from patterns of distribution - even though it is also accepted that planets originally seeded may well have altered orbits over the millenia. In short, this seems a poorly put together proposition which is far - reaching yet simultaneously ignorant of current discoveries . Sloppy science, shame on them.