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post #181 of 188 Old 06-06-2014, 11:36 PM
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The CODA (answer) The wiki edition. This is a hypothetical. One should really ask the pocket-protector guys, perhaps a well respected astrophysicist for example. wink.gif

1) The slow rotation of Venus means Venus has little to no magnetic field. This makes Venus more vulnerable to the solar wind. So how does this matter to the runaway greenhouse? It didn't immediately. The runaway was already well underway vaporizing the oceans (H20 is also a fairly good greenhouse gas, BTW) Once the H20 was fully vaporized, it was split into free H2 and O2 by photo-dissociation. The lack of magnetic field then allowed the solar wind to strip all the H2 from the atmosphere ... essentially sealing the fate of Venus forevermore. No H2, no H2O ... no possible place left for the CO2 to go. It should be noted that this was the last event in the chain that started much earlier.

2) The only possible impact of a satellite would be to exert tidal forces leading to *increased* plate movement and subsequent volcanic activity. So the lack of a satellite might actually help slow down the runaway. Although, I suppose a moon might have absorbed a few asteroid hits. So ... perhaps a wash on that one.

Was that so hard? smile.gif
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post #182 of 188 Old 06-07-2014, 12:35 AM
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Originally Posted by HDTVChallenged View Post

The CODA (answer) The wiki edition. This is a hypothetical. One should really ask the pocket-protector guys, perhaps a well respected astrophysicist for example. wink.gif

1) The slow rotation of Venus means Venus has little to no magnetic field. This makes Venus more vulnerable to the solar wind. So how does this matter to the runaway greenhouse? It didn't immediately. The runaway was already well underway vaporizing the oceans (H20 is also a fairly good greenhouse gas, BTW) Once the H20 was fully vaporized, it was split into free H2 and O2 by photo-dissociation. The lack of magnetic field then allowed the solar wind to strip all the H2 from the atmosphere ... essentially sealing the fate of Venus forevermore. No H2, no H2O ... no possible place left for the CO2 to go. It should be noted that this was the last event in the chain that started much earlier.

2) The only possible impact of a satellite would be to exert tidal forces leading to *increased* plate movement and subsequent volcanic activity. So the lack of a satellite might actually help slow down the runaway. Although, I suppose a moon might have absorbed a few asteroid hits. So ... perhaps a wash on that one.

Was that so hard? smile.gif
Right, meaning the fact that Venus has a very long day had absolutely nothing to do with the point NdGT was making. What he was showing was what excess CO2 emissions could end up doing to the planet and had nothing to do with how they occurred, a crucial point that seemed to be missed by some.
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post #183 of 188 Old 06-07-2014, 12:48 AM
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Ok ... lets let it rest before DrDon has to return. The one other factoid is that because Venus rotates in "reverse" the actual solar day is ~117 earth days. Again ... not really relevant to the story.

Let there be peace. smile.gif

PS: NdGT did state that, "Venus lost its oceans to space." He just didn't go into the specific details. wink.gif
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post #184 of 188 Old 06-07-2014, 02:50 PM
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So you are telling us that the movie Queen_of_Outer_Space_[1958] starring zsa zsa gabor was fiction?

In case anyone missed it, an American spaceship lands on Venus, where perfect weather, breathable air, and a bunch of supermodels greets them.
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post #185 of 188 Old 06-07-2014, 04:00 PM
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So you are telling us that the movie Queen_of_Outer_Space_[1958] starring zsa zsa gabor was fiction?

In case anyone missed it, an American spaceship lands on Venus, where perfect weather, breathable air, and a bunch of supermodels greets them.

 

That is every bit as real as Abbott and Costello Go to Mars (1953), again with great weather, breathable air, and a bunch of supermodels on Venus.

Warning: Spoiler! (Click to show)
(Hint: Bud Abbott and Lou Costello never make it to Mars.)

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post #186 of 188 Old 06-07-2014, 04:04 PM
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Originally Posted by grittree View Post

So you are telling us that the movie Queen_of_Outer_Space_[1958] starring zsa zsa gabor was fiction?

In case anyone missed it, an American spaceship lands on Venus, where perfect weather, breathable air, and a bunch of supermodels greets them.

This was obviously before the atmosphere went to crap.
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post #187 of 188 Old 06-09-2014, 06:37 PM
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Did anyone catch the end of the season finale? The scene with all stars against a black background. Anyone with a new 4k set that can comment on how their set handled this local dimming test?
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post #188 of 188 Old 06-12-2014, 05:45 AM
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Did anyone catch the end of the season finale? The scene with all stars against a black background. Anyone with a new 4k set that can comment on how their set handled this local dimming test?
Is this show being broadcast in native 4k? Are any yet? If not, what difference would it make? Like upconverted HD from SD, you can't create detail by electronic extrapolation that wasn't there to begin with.

I know Netflix is transmitting some actual "real" 4k content, but I haven't heard of anyone else, much less a broadcast network whose feed would then be re-transmitted by a cable or satellite provider.
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