Free Samples from Mars - Paul De Carli (SETI Talks)
Μετάδοση με ζωντανή ροή στις 23 Ιουλ 2013
SETI Talks archive: http://seti.org/talks
Martian
meteoriteIn the late 70's meteoriticists began to speculate that some
oddball meteorites might be from Mars. These meteorites looked more like
terrestrial rocks than meteorites, but they were seen to fall-
Chassigny in 1815, Shergotty in 1865, and Nakhla in 1911. The big
question, how these SNC meteorites got here, seemed to be solved by the
"spall mechanism", a combination of high velocity and low shock
pressure. Although the "spall mechanism" is shown to be spurious,
trapped Martian atmosphere and isotope ratios provide convincing
evidence that some 67 (as of 8 June) distinct meteorites are from Mars.
George
Wetherill's mechanism, acelleration by the expansion of
shock-compressed water is shown to be a viable means of getting
meteorites from Mars to the Earth. Since the "spall mechanism" is still
generally accepted by the Planetary Science community, it will be
discussed in detail and shown to an artifact of computer code
calculations. There is also evidence from the shock-induced high
pressure phases in some martian meteorites that they were too deep in
Mars to have been launched by the "spall mechanism".
Martian
meteoriteIn the late 70's meteoriticists began to speculate that some
oddball meteorites might be from Mars. These meteorites looked more like
terrestrial rocks than meteorites, but they were seen to fall-
Chassigny in 1815, Shergotty in 1865, and Nakhla in 1911. The big
question, how these SNC meteorites got here, seemed to be solved by the
"spall mechanism", a combination of high velocity and low shock
pressure. Although the "spall mechanism" is shown to be spurious,
trapped Martian atmosphere and isotope ratios provide convincing
evidence that some 67 (as of 8 June) distinct meteorites are from Mars.
George
Wetherill's mechanism, acelleration by the expansion of
shock-compressed water is shown to be a viable means of getting
meteorites from Mars to the Earth. Since the "spall mechanism" is still
generally accepted by the Planetary Science community, it will be
discussed in detail and shown to an artifact of computer code
calculations. There is also evidence from the shock-induced high
pressure phases in some martian meteorites that they were too deep in
Mars to have been launched by the "spall mechanism".
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 9/3/2014
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