Maximum Number of Habitable Planets at the Time of Earth's Origin: New Hints for Panspermia?

Details Maximum Number of Habitable Planets at the Time of Earth's Origin: New Hints for Panspermia? Maximum Number of Habitable Planets at the Time of Earth's Origin: New Hints for Panspermia?

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003oleb...33..219v&link_type=abstract

Origins of Life and Evolution of the Biosphere, v. 33, Issue 2, p. 219-231 (2003).

Mathematics

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Scientific paper

New discoveries have fuelled the ongoing discussion of panspermia, i.e. the transport of life from one planet to another within the solar system (interplanetary panspermia) or even between different planetary systems (interstellar panspermia). The main factor for the probability of interstellar panspermia is the average density of stellar systems containing habitable planets. The combination of recent results for the formation rate of Earth-like planets with our estimations of extrasolar habitable zones allows us to determine the number of habitable planets in the Milky Way over cosmological time scales. We find that there was a maximum number of habitable planets around the time of Earth's origin. If at all, interstellar panspermia was most probable at that time and may have kick-started life on our planet.

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