Possibilities for methanogenic and acetogenic life in molecular cloud

Abstract

There are life forms in space and the ancestor of Earth life came from interstellar space according to models like panspermia. Naturally, life may also exist in molecular clouds. Here the author discusses the possibility of methanogenic life in Molecular Cloud with methane as the final metabolism product. According to the calculations, it is easy to see that the chemical reaction through methanogenesis can release sufficient free energy. If methanogenic life exist in the pre-solar nebula, then they may be the ancestor of Earth's life and there are already some tentative evidences by several molecular biology studies.