[meteorite-list] "Secondary" craters on Mars and Carancas
From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Tue, 8 Apr 2008 08:18:22 -0700 (PDT) Message-ID: <392590.51681.qm_at_web36902.mail.mud.yahoo.com> Hi all - Speaking of the small crater at Carancas, a prominent theory put forward to explain the number of craters on Mars is "secondary" craters formed by the impact of large ejecta from "primary" impacts, i.e.: http://hirise.lpl.arizona.edu/PSP_007059_1975 Given the energy required to form an impact crater of any size, I am very suspicious of this hypothesis. I can't see how any large ejecta from a "primary" impact could reach sufficient velocity to have the energy necessary to form these "secondary" craters, and I think that some may be engaging in wishful thinking in this regard. Given what we know of asteroids and comets, smaller chunks of a "primary" impactor impacting at the same time might be a more viable hypothesis. Any thoughts, anyone? good hunting all, ("d" is too close to "f" with my stroke, and "goof" is as good a word as "good" to a spell checker.) E.P. Grondine Man and Impact in the Americas ____________________________________________________________________________________ You rock. That's why Blockbuster's offering you one month of Blockbuster Total Access, No Cost. http://tc.deals.yahoo.com/tc/blockbuster/text5.com Received on Tue 08 Apr 2008 11:18:22 AM PDT |
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