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19.12.2015
A thoroughly sporadic column from astronomer Mike Brown on space and science, planets and dwarf planets, the sun, the moon, the stars, and the joys and frustrations of search, discovery, and life. Seven years ago, the moment I first calculated the odd orbit of Sedna and realized it never came anywhere close to any of the planets, it instantly became clear that we astronomers had been missing something all along. Of all of the planets, comets, asteroids, and Kuiper belt objects in the solar system, Sedna is the only one that tells us this astounding fact so glaringly. The second possibility that we considered and wrote about was that perhaps a star had passed extremely close to our solar system at some point during the lifetime of the sun. If Sedna got put on its peculiar orbit by the interactions of all of these stars 4.5 billion years ago, it is now a fossil record of what happened at the time of the very birth of sun.
Pavel SmutnyOctober 28, 2010 at 10:00 AMSedna is on elliptical orbit (period 12000years) with quite high eccentricity.
Either something large once passed through the outer parts of our solar system and is now long gone, or something large still lurks in a distant corner out there and we haven’t found it yet.
The orbit of every single other object in the entire solar system can be explained, at least in principle, by some interaction with the known planets. Our first idea was that perhaps there was an unknown approximately earth-sized planet circling the sun about twice the distance of Neptune. Instead of getting one big kick from an improbably passing star, imagine that Sedna got a lot of really small kicks from many stars passing by not quite as closely.
Everything else in the solar system has been kicked and jostled and nudged by planets big and small so there is no way to trace them back 4.5 billion years.
1.It means, that Sedna could by synchronised with object (Nemesis)what has circa circular orbit with period till 25000 years, what is also approx.


A star passing by that close would have been brighter than the full moon and would have been the brightest thing in the night sky for hundreds of years. The chances of this happening might seem low, too, but astronomers have long known that most stars are born not alone, but in a litter of many stars packed together. Sedna, on the other hand, has been doing nothing but going around and around the sun in its peculiar elongated orbit every 12,000 years. After almost half a million of those orbits, Sedna remains lonely and untouched by anything else. Sedna, before the rogue star came calling, would have been a normal Kuiper belt object with a looping orbit which would take it out to the distant solar system but then eventually back to Neptune (which had, presumably kicked it around earlier).
And in the years since Sedna’s discovery other astronomers have chimed in with their own ideas, including the possibility that Sedna was kicked by something large out in the Oort cloud (small planet? If you had just that one skeleton you would know just what to do: head back out into the desert and start digging. But on one of its trips to the edge of the solar system, Sedna would have accidentally gotten too close to this interloping star, and the star would have given Sedna another little kick. In the cluster of stars in which the sun might have been born there would have been thousands or even tens to hundreds of thousands of stars in this same volume, all held together by the gravitational pull of the massive amounts of gas between the still-forming stars. When we found Sedna, we, too, knew what was next: head back out into the night and keep looking.
I firmly believe that the view from the inside of one of these clusters must be one of the most awesome sights in the universe, but I suspect no life form has ever seen it, because it is so short-lived that there might not even be time to make solid planets, much less evolve life. Until we found more, we wouldn’t know what this profound bit of the solar system was trying to scream so loudly in our ears.


This makes me think of planet and not star being at the origin, because I would not expect extra-solar objects (other stars) to have any relation with the ecliptic plane (what's the chance? The orbit would, of course, have to go back to the spot where Sedna had gotten the kick from the passing star, but the star would be long gone by then. For as the still-forming stars finally pull in enough of the gas to become massive enough to ignite their nuclear-fusion-powered cores they quickly blow the remaining gas holding everything together away and then drift off solitary into interstellar space. This idea was a fun one, and, best of all, we could do a reasonably good job estimating the probability that something like this might have occurred. But I will have to wait for the next releases, it seems.ReplyDeleteCTOctober 28, 2010 at 11:53 AMDid you create that image of two suns yourself? Looking at the number of star near us in the galaxy and fast they all move relative to each other, we found that the chances of such a rogue star encounter happening sometime in the past 4.5 billion years was around 1%.
And, while we see these processes occurring out in space as other stars are being born, we really have no way to see back 4.5 billion years ago and see this happening as the sun itself formed. Yes, because, in this hypothesis, Sedna used to orbit a different star, and the sun got close and kicked Sedna around and stripped if away.
Just because I believe there to be no scientific evidence of Planet X (and **certainly** no **hint** of evidence that anything frightening is going to happen in 2012 other than the London Olympics) does not mean that something distant is out there.



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