Venus Radar Request, From Earth |
Venus Radar Request, From Earth |
Mar 7 2006, 02:43 AM
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#1
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Senior Member Group: Members Posts: 1276 Joined: 25-November 04 Member No.: 114 |
I'm looking for earth based radar mapping of Venus.
I've had a hard time finding much. I clearly remember seeing images in books as a child. Any help would be great! |
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Guest_BruceMoomaw_* |
Mar 9 2006, 01:03 AM
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#2
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Guests |
In reality, it wouldn't make a tinker's damn to Venus' chances of sustaining life whether it had a large moon or not -- its death warrant was signed the moment it formed close enough to the Sun to activate the "moist greenhouse" effect that stripped it of all its initial water and so allowed its volcanically released CO2 to build up and produce a huge blanket with a killer greenhouse effect.
Kevin Zahnle has an interesting new LPSC abstract ( http://www.lpi.usra.edu/meetings/lpsc2006/pdf/2359.pdf ) in which he claims that an Earthlike planet like Dune -- which started out with less water than Earth, but not NO water -- would actually be capable of sustaining a small biosphere much closer to the Sun than a planet which started out with a large water supply, because its moist-greenhouse effect would be minimal. However, he doesn't explain how that small initial amount of water could lock up most of the planet's CO2 in carbonate rocks, and thus why that planet wouldn't simply proceed to Venus' final fate much more directly. (Come to think of it, didn't we learn in the first Dune book that the planet actually had quite a bit of water overall, but the Little Makers sealed most of it off underground and prevented it from reaching the surface? If so, then before the Sandworms evolved -- since the Little Makers are their larval stage -- the planet must have been relatively wet and friendly. Kind of a reverse-Gaia effect.) |
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