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The seven ages of a planetOn the basis of almost universally held assumptions concerning the formation of the planets and the isolation of the solar system from outside influences it follows rather plausibly that all terrestrial planets pass in principle through seven stages. The processes involved include the solidification of grains from gas in the condensation stage, planetesimal interactions, and formation processes. Vigorous convection processes lead to the gravitational separation of iron and the outgassing of oceans. Other stages are related to plate tectonics and terminal volcanism. The ultimate stage of quiescence is characterized by a thick lithosphere and no volcanism.
Document ID
19760031393
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kaula, W. M.
(California, University Los Angeles, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
September 1, 1975
Publication Information
Publication: Icarus
Volume: 26
Subject Category
Lunar And Planetary Exploration
Accession Number
76A14359
Funding Number(s)
CONTRACT_GRANT: NSF GA-40749
CONTRACT_GRANT: NGL-05-007-002
Distribution Limits
Public
Copyright
Other

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