Have you seen this yet; http://www.pbs.org/exploringspace/meteorites/murchison/index.html It seems inescapable that the earth's composition was enhanced by meteorites such as Murchison Meteorite, which means that there must be other, much older planets where these amino acids and other complex compounds were formed. The sun is but a young star and there must be millions of older stars with planetary systems. A few collisions and presto we have the seeds of life scattering throughout the universe and must have been present in the cosmic cloud which yielded the formation of our sun and planetary system, and the greater solar system or may have arrived and landed somewhat later. These meteorites must have been the debris of planet/planet or meteor/planet collisions and ended up in in the earth, making it possible (in view of our solar "comfort zone') to cook up a living organism in the primordial soup, with the aid of these complex molecules. I am confident that earth life is unique to earth, regardless of life elsewhere in the universe, but we can say that life on earth was a gift from many dying planets.