Venus Slowing Down - WTF!!??! | |
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Resister User ID: 1461638 United States 02/11/2012 01:04 PM Report Abusive Post Report Copyright Violation | The destroyer cometh. "God forbid we should ever be 20 years without such a rebellion. The people cannot be all, & always, well informed... If they remain quiet under such misconceptions it is a lethargy, the forerunner of death to the public liberty... Let them take arms... What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots & tyrants. " - Thomas Jefferson in 1787 |
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NiNzrez User ID: 10498853 United States 02/11/2012 03:07 PM Report Abusive Post Report Copyright Violation | Join Me On The GLP SOLAR WATCH Thread Thread: SOLAR WATCH * Huge X8.2 Flare Sept. 10, 2017! (Updated Daily) |
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Sol-Magmatard 26 User ID: 8851414 United States 02/11/2012 03:32 PM Report Abusive Post Report Copyright Violation | New measurements from ESA’s Venus Express spacecraft shows that Venus’ rotation rate is about 6.5 minutes slower than previous measurements taken 16 years ago by the Magellan spacecraft. Using infrared instruments to peer through the planet’s dense atmosphere, Venus Express found surface features weren’t where the scientists expected them to be. Quoting: Anonymous Coward 10036138 [link to www.universetoday.com] edited to fix symbols This is actually expected by tide lock theory, other factors not yet worked in to the formula include obliquity locking, tidal drag by satellites and nearby orbiting bodies. Minimum time to tide lock with parent body T~(a^6 wIQ)/(3Gm_p^2 k_2 R^5 ) w is the initial rotation period of the primary body in rad/s a is the semi-major axis of the secondary body G is the gravational constant m_p is the mass of the primary body m_s is the mass of the secondary body R is the radius of the secondary body I is the moment of inertial for the secondary body I~0.4m_s R^2 Q is the dissipation function of the secondary body (typically between 50 and 500) see [link to en.wikipedia.org] for equation k_2~1.5/(1+(19u/2pgR)) p is the density of the secondary body u is the rigidity of the secondary body in terms of crushing pressure; This can be taken as 3×10^10 Nm^(-2) for rocky objects and 4×10^9 Nm^(-2) for icy ones as an estimation,if you want to refine determine what pressure is needed per square meter to deform the normal crystal lattice of the substance averaged over the composition of the body. g is the surface gravity of the secondary body g~(Gm_s)/(R_V^2 ) R_v is the mean volumetric radius of the secondary body I believe this to be related to Obliquity Erosion when a planet looses it tilt over time but more research is needed. Last Edited by Sol-Magmatard 26 on 02/11/2012 03:35 PM formerly Magmatard 26 |
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Anonymous Coward User ID: 10558294 Germany 02/12/2012 05:01 AM Report Abusive Post Report Copyright Violation | this is an amazing discovery... Recent atmospheric models have shown that the planet could have weather cycles stretching over decades, which could lead to equally long-term changes in the rotation period. So the Atmosphere is responsible for slowing down the rotation of Venus by 6.5min??? That seems very unlikely. After all, after millions of years in orbit shouldn`t Venus be standing still by then? |
Anonymous Coward (OP) User ID: 10036138 United Kingdom 02/12/2012 05:05 AM Report Abusive Post Report Copyright Violation | 1. Venus was a key part of the Mayan celestial calendar dating system. So the question has to be asked, is what we seeing an 'end' to their system of dating, and thus the soon to be 'end' of their calendar? 2. If Venus is slowing at such an bizarre rate, is a large gravitational force to blame? ( Large passing object? ) |
Anonymous Coward User ID: 3114424 United States 02/12/2012 05:11 AM Report Abusive Post Report Copyright Violation | So, how do you suppose that will affect the venus cycle discussed in this thread: Thread: The Real Secret of the Pentagram - Venus Transit - 6/6/12 - and ISON |
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Nacht im Walde User ID: 10558294 Germany 02/12/2012 05:37 AM Report Abusive Post Report Copyright Violation | this is an amazing discovery... Quoting: Anonymous Coward 10558294 Recent atmospheric models have shown that the planet could have weather cycles stretching over decades, which could lead to equally long-term changes in the rotation period. So the Atmosphere is responsible for slowing down the rotation of Venus by 6.5min??? That seems very unlikely. After all, after millions of years in orbit shouldn`t Venus be standing still by then? [edit: This is a very rough etimate; I forgot about the difference in rotational inertia for Venus so the numbers here are much to high. However, it is still a huge amount necessary for this kind of change] 6.5 min in 16 years means that the rotation of Venus slowed down by 25,6 seconds a year! Venus and earth are roughly the same size. So to understand how much energy would be required to have such an effect of the rotation of a planet let`s look at the Japan earthquake of 2011: Japan earthquake sped up Earth`s rotation by 1.8 microseconds a day or 0,0000018 seconds a day In a year that would translate to 0,000657 seconds a year But remember that 25,6 seconds is 38,864 times more significant (longer) than 0,000657 seconds The Japan earthquake was equivalent to 9,320 gigatons of TNT, or approximately 600 million times the energy of the Hiroshima bomb. 25,6 seconds a year would then translate to 9,320 gigatons x 38,864 = 362,221,480 gigatons of TNT But then we still have to multiply this by 16 years which is 6.5min = 5,795,399,690 gigatons of TNT To grasp this number we can multiply 38,864 x 16 = 621,824 So imagine An earthquake which is 621,824 times stronger than the Japan earthquake and you get the idea of how much energy it would require to slow down Venus by 6.5min!!! [edit: a more accurate estimate is 2657 times stronger!] A tremendous energy would be required to slow down a planet the size of Venus! I am no expert on climate, but to say that this could have been caused by weather patterns sounds extremely far fetched. There simply isn`t enough energy. Last Edited by Nacht im Walde on 02/12/2012 12:36 PM We don't see things as they are, we see things as we are. - Anais Nin |
Anonymous Coward (OP) User ID: 10036138 United Kingdom 02/12/2012 05:59 AM Report Abusive Post Report Copyright Violation | "Other effects could also be at work, including exchanges of angular momentum between Venus and the Earth when the two planets are relatively close to each other." [link to truthdive.com] Now this is interesting, as if i recall, due to the laws of energy conservation, if Earth is changing Venus's rotational speed, earth should be affected too? |
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Nacht im Walde User ID: 10558294 Germany 02/12/2012 06:20 AM Report Abusive Post Report Copyright Violation | "Other effects could also be at work, including exchanges of angular momentum between Venus and the Earth when the two planets are relatively close to each other." Quoting: Anonymous Coward 10036138 [link to truthdive.com] Now this is interesting, as if i recall, due to the laws of energy conservation, if Earth is changing Venus's rotational speed, earth should be affected too? yep, I think so too. I guess what they are saying is that the gravitational field of each planet would influence each other in a way that it would impact the angular momentum (meaning rotation). But that would certainly also effect earth as well. And we haven`t slowed down in the last 16 years. I don`t want to speculate too much, but it is also interesting to note that Venus plays a big role in the Electric Universe Theory. They think that Venus might have been once a comet... To me it seems more likely that something external is causing a decrease in angular momentum. This is really a huge find... Last Edited by Nacht im Walde on 02/12/2012 06:21 AM We don't see things as they are, we see things as we are. - Anais Nin |
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Albanian-1 User ID: 3037750 Canada 02/12/2012 06:59 AM Report Abusive Post Report Copyright Violation | great thread.. well done OP and the german (Nacht im Walde) input! scawyyy Last Edited by Albanian-1 on 02/12/2012 06:59 AM Albanian-1 |
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