Stardust and Origin of Life

Abstract

In the previous chapters of this book, we have presented evidence that organic compounds are common in the Galaxy. They are in our backyards, as interplanetary dust particles, floating around beyond the Earth in the space between planets. They are in asteroids, the remnants left over from the early Solar System. They are in comets, visitors from the outer parts of the Solar System which carry pristine original materials. They are in planetary satellites, Titan being the prime example where organics are believed to be widespread both in its atmosphere and on its surface. Most importantly, they are part of the bulk components of carbonaceous meteorites, which represent bits and pieces of comets and asteroids and had fallen onto the Earth. It is from the analysis of meteorites that we have obtained the most information on the primordial organics, organics, the creation of which dates back to at least the beginning of the Solar System 4.6 billion years ago.