Mathematics – Logic
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981lastr..95..293d&link_type=abstract
(Reunion Regionale Europeenne d'Astronomie, 5th, Liege, Belgium, July 28-Aug. 1, 1980.) L'Astronomie, vol. 95, June 1981, p. 293
Mathematics
Logic
Big Bang Cosmology, Biological Evolution, Comets, Earth (Planet), Universe, Chronology, Planetary Evolution, Relic Radiation, Solar System, Stellar Evolution, Terrestrial Planets
Scientific paper
Current understandings of the nature and evolution of the universe and of the earth are summarized as a background to the discussion of the origin of life on earth as the result of the transport of the necessary materials to earth by comets. Evidence for the origin of the universe in the Big Bang supplied by observations of the expansion of the universe and the cosmic microwave background is discussed, and the condensation of primordial matter into galaxies and stars and the chemical processes in stars converting primordial hydrogen and helium into heavy elements as the stars evolve giving rise to an interstellar medium are considered. Attention is then given to the birth of the solar system from the contraction of a dark interstellar cloud containing gas, dust and interstellar molecules, and in particular to the origin of the terrestrial planets and the cometary contributions to the terrestrial crust, oceans and atmosphere. Finally, the chronology of the universe from the Big Bang to the present and that of the earth from its formation to the present are reviewed.
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