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Ummmya
ANSWERS: 4
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The Halley comet
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The Oort cloud is a postulated spherical cloud of cometary nuclei that starts several times further out from the sun than Pluto's orbit and is thought to go a quarter of the distance to the next closest star (Proxima Centauri). As of yet, only two bodies that might belong to this cloud have actually been discovered. So, we don't actually know that it exists. http://en.wikipedia.org/wiki/Image:Oort_cloud_Sedna_orbit.jpg
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Mainly Comets with most likely some asteroidal rock fragments. This is a predicted spherical cloud that is situated between a region of about 1 to 1000 times the distance of Pluto's furthest orbit point (~50 to ~50,000 AU). The Oort Cloud is believed to be where we get our comets from. Since comets lose mass everytime they move close to our Sun they don't last forever and eventually completely break up and the Oort Cloud provides a good source of new comets. For this to occur the Cloud would have be gravitationally disturbed by another body moving close enough to our solar system (anoter star system for example). It would only need to disrupt the cloud enough to break comets out from their place in the Oort Cloud and send them flying inwards to the Sun. This would also be the likeliest place that the meteorite that is believed to have killed the dinosaurs would have come from because of the low gravitational pull our own Sun has on the Cloud at such a far distance and so the ease other outside bodies could disrupt it.
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The Annunaki of planet Nibiru! :) (And no, those are not made-up words.)
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