Venera Images, VENERA 13 fully calibrated image |
Venera Images, VENERA 13 fully calibrated image |
Sep 14 2005, 09:26 PM
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Senior Member Group: Members Posts: 1089 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
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Jan 10 2006, 06:30 PM
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
{ I hope I phrase this well enough }
Does any one know the cooling rate for 'earth type' basaltic magma from the time of contact with liquid water to the point it has solidified as compared to the expected cooling rate for the Venusian equivalent of basaltic magma from the time of contact with the Venusian atmosphere to the point of solidification? Is 1300 psi (or whatever it works out to) CO2 more heat absorbing than H2O at 15 psi ? Funny if the magma on Venus solidifies faster than the magma on earth in contact with sea water. Would this effect the forms of the rocks we expect to see? |
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Jan 10 2006, 06:50 PM
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
QUOTE (tasp @ Jan 10 2006, 10:30 AM) { I hope I phrase this well enough } Does any one know the cooling rate for 'earth type' basaltic magma from the time of contact with liquid water to the point it has solidified as compared to the expected cooling rate for the Venusian equivalent of basaltic magma from the time of contact with the Venusian atmosphere to the point of solidification? Is 1300 psi (or whatever it works out to) CO2 more heat absorbing than H2O at 15 psi ? Funny if the magma on Venus solidifies faster than the magma on earth in contact with sea water. Would this effect the forms of the rocks we expect to see? Sea water on Earth is only at 15 psi at the shoreline (eg, on a beach). The pressure is much higher in locations of typical seafloor magma exposure, and would certainly have a much higher thermal inertia than Venus's CO2. It's also much cooler, which is another factor in the speed of heat propagation. Water, even at 15 psi, is roughly 1000 times as dense as Earth air. Sea water is even denser. Venus's surface atmosphere is very roughly (no time for math now!) 75 times as dense as Earth air. Anyone who has stood in a 10 km/h breeze and has also been hit by a 10 km/h ocean wave will appreciate the vast difference. Venus's atmosphere is in the middle. |
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Jan 11 2006, 05:00 PM
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Member Group: Members Posts: 114 Joined: 6-November 05 From: So. Maryland, USA Member No.: 544 |
Does anyone else remember the "fact" that refraction in the dense Venusian atmosphere would be so strong that you could see the back of your own head? I remember puzzling over that for hours as a kid, but I never really believed it.
Michael QUOTE (JRehling @ Jan 10 2006, 01:50 PM) Sea water on Earth is only at 15 psi at the shoreline (eg, on a beach). The pressure is much higher in locations of typical seafloor magma exposure, and would certainly have a much higher thermal inertia than Venus's CO2. It's also much cooler, which is another factor in the speed of heat propagation.
Water, even at 15 psi, is roughly 1000 times as dense as Earth air. Sea water is even denser. Venus's surface atmosphere is very roughly (no time for math now!) 75 times as dense as Earth air. Anyone who has stood in a 10 km/h breeze and has also been hit by a 10 km/h ocean wave will appreciate the vast difference. Venus's atmosphere is in the middle. |
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