Why SuperEarths are not Earthlike - David Stevenson (SETITalks)
Μετάδοση με ζωντανή ροή στις 25 Μαρ 2014
Kepler data indicate that there are
many planets that could be Earthlike in the sense of having a similar
bulk composition. I will explain why such planets are unlikely to be
Earthlike in other respects, especially if they are superEarths (three
or so Earth masses or more). There are three main points here: (1)
SuperEarths will not separate core from mantle because they are likely
to be so hot internally that the critical temperature is reached for
miscibility of iron alloy and silicate material. (2) Earth is (so far as
we know) special in having a water budget that (expressed as an ocean)
corresponds to water depths ~ mountain heights.(3) The surface will be
hot either from a massive atmosphere or proximity to the parent star.
many planets that could be Earthlike in the sense of having a similar
bulk composition. I will explain why such planets are unlikely to be
Earthlike in other respects, especially if they are superEarths (three
or so Earth masses or more). There are three main points here: (1)
SuperEarths will not separate core from mantle because they are likely
to be so hot internally that the critical temperature is reached for
miscibility of iron alloy and silicate material. (2) Earth is (so far as
we know) special in having a water budget that (expressed as an ocean)
corresponds to water depths ~ mountain heights.(3) The surface will be
hot either from a massive atmosphere or proximity to the parent star.
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Τυπική άδεια YouTubeΑΝΑΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 26/3/2014
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