An Estimate Of The Prevalence Of Biocompatible And Habitable Planets

M. J. Fogg. (1992), JBIS, 45, pp.3-12

Refcode: 1992.45.3

Abstract:

It is likely that life was already present by a billion years after the formation of the Earth. Unless our planet was “seeded” with life from without, a hypothesis only taken seriously by a small minority of scientists, its genesis must have occurred spontaneously within a few hundred million years following the Earth’s accretion.