Physics – Geophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..405s&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 405-407 (SEE N87-23341 16-91)
Physics
Geophysics
Asteroids, Comets, Geochronology, Projectile Cratering, Venus Surface, Atmospheric Effects, Comet Nuclei, Gravitational Effects
Scientific paper
The population of Venusian craters having suspected impact crater morphology has been reported from 115 x 10 to the 6th power sq km of the northern hemisphere of the planet with the estimated average age of the surface to be approx. 1 b.y. (+ or - 0.5 b.y.) on the basis of lunar crater production curves corrected for Venus. Such an old average age is somewhat difficult to reconcile with the similarity in size and mass of Venus and Earth and with Earth's high heat flow and crustal resurfacing rate. Given the present uncertainties in the role of both active and inactive comet nuclei in the cratering history of Earth, it is concluded that the average age of the observed surface in the northern hemisphere of Venus could be as great as the 450 m.y. mean age of the Earth's crust. The surface of Venus might be even older, but no evidence from the crater observations support an age as great as 1 b.y.
Kozak Richard C.
Schaber Gerald G.
Shoemaker Eugene M.
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