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When Worlds Collide
Two Earth-sized planets in orbit around a double star... then, one
day...KA-BLEWEY! http://www.astrobio.net/news/index.p...ticle&sid=2886 Pat |
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When Worlds Collide
On Oct 5, 1:23*pm, Pat Flannery wrote:
Two Earth-sized planets in orbit around a double star... then, one day...KA-BLEWEY!http://www.astrobio.net/news/index.p...ticle&sid=2886 Pat This is interesting. Two stars come to orbit one another very closely. So, closely that astronomers thought it was one star. They wondered about the excessive dust. Two planetary systems orbiting in opposite directions in nearly the same plane. This would be like driving down the wrong side of the highway. Its only a matter of time before a collision! Then of course, debris flies off in all directions, showering the other planets. Eventually, the angular momentum of both systems cancel, and it all falls down! Sheez. At the end they note that even small collisions have dire consequences - yeah. Here's what would happen if a small Ceres sized object struck Earth http://www.youtube.com/watch?v=yYgEwXWilUc Of course, the moon was formed when the proto Earth - smaller than today's Earth - collided with a mars sized object.- moving in the same direction. Moving in opposite directions, both planets would have been obliterated. Moving in the same direction, two planets would have hit one another with a 10 km/sec speed, which would be less than their escape velocity - leaving debris that would eventually fall back together - leaving perhaps a large moon. Off axis collisions would cause the objects to spin wildly as the careened off one another. Moving in opposite directions in the same plane the two planets would hit one another with 70 km/sec speed, ejecting material across the ecliptic.- off axix collisions would have caused objects to spin even more wildly - tearing apart from the spin. |
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When Worlds Collide
wrote in message
... On Oct 5, 1:23 pm, Pat Flannery wrote: Two Earth-sized planets in orbit around a double star... then, one day...KA-BLEWEY!http://www.astrobio.net/news/index.p...ticle&sid=2886 Pat This is interesting. Two stars come to orbit one another very closely. So, closely that astronomers thought it was one star. They wondered about the excessive dust. Two planetary systems orbiting in opposite directions in nearly the same plane. This would be like driving down the wrong side of the highway. Its only a matter of time before a collision! Then of course, debris flies off in all directions, showering the other planets. Eventually, the angular momentum of both systems cancel, and it all falls down! Sheez. At the end they note that even small collisions have dire consequences - yeah. Here's what would happen if a small Ceres sized object struck Earth http://www.youtube.com/watch?v=yYgEwXWilUc Of course, the moon was formed when the proto Earth - smaller than today's Earth - collided with a mars sized object.- moving in the same direction. Moving in opposite directions, both planets would have been obliterated. Moving in the same direction, two planets would have hit one another with a 10 km/sec speed, which would be less than their escape velocity - leaving debris that would eventually fall back together - leaving perhaps a large moon. Off axis collisions would cause the objects to spin wildly as the careened off one another. Moving in opposite directions in the same plane the two planets would hit one another with 70 km/sec speed, ejecting material across the ecliptic.- off axix collisions would have caused objects to spin even more wildly - tearing apart from the spin. =================================== I just watched the video, it was interesting. In fact, there are very many such scenarios that could happen and sooner or later, one of them certainly will. The processes that made this solar system are certainly not going to stop just because we are here at this time. Details! Astronomically speaking. That is because our solar system's mechanics are chaotic, not stable, perfect, and eternal. If you add to this the business of selling arms, very profitable to the makers of the arms but intensely destabilizing to everyone else, and the governments and even large institutions who can now build their own bacteriological and nuke weapons, it all adds up to practical certainty that at a point, it all comes down. All our world. That's why I'm advocating to spend a little of that military money somewhere else: to build settlements off-Terra, enough of them to amount to an economic system that can survive if Terra doesn't. This would be a winner to do in at least three ways: 1) Lots of brownie points to whoever's language is the human language of the Solar System. ...Mandarin Chinese? 2) I don't think the Ceres scenario features human survivors. Very many of those don't. Except, if we have those settlements and economic network out there, off-Terra. Thus off-Terra settlement and economics are a very good insurance. This insurance is today accessible and for the past 50 years. Kind of bad to be doing without it for ...whatever reasons. 3) Movement into space could give us a frontier again. Presently, we've exhausted our local resources for frontiers, or made them into war zones. The new frontiers could provoke a needed renaissance, large change from the present increasingly autocratic way of things, so that *maybe* plain rationality could come back into governmental styles. Then the system crash so easily foreseen, could be relegated to horror stories for those who like reading constructions of deviant history. And the astro crash may be inevitable but it's (probably) very much farther away than what our governments are up to. I hope for reason again here in America. But one of the candidates is truly remarkable: she's a living proof that "virulent" and "mundane" can indeed both co-exist in one single person. Further, she seems to be a millennialist: she believes the Christian 'Last Days' and 'Rapture' will happen *in her life time*. Imagine her as President. With her thumb on the nuclear Big Red Button. Anyhow, I'm not seeing a lot of good sign for the future. Titeotwawki -- mha [sci.space.policy 2008 Oct 06] |
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