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" ... 9.) Snowy weather on comets. The ESA’s Rosetta mission witnessed cometary “snow” firsthand. ... "
" ... And it’s this “cometary shrapnel” that is the problem. “On the journey back to the Oort Cloud there’s an enhanced probability that one of these fragments hit the Earth,” said Siraj. ... "
" ... But during these passages close to the Sun, large comets are gravitationally disrupted, producing fields of cometary shrapnel, Siraj, a Harvard undergraduate studying astrophysics at the Harvard & Smithsonian center for Astrophysics, told me. Most of these Chicxulub-sized fragments miss the Earth, he says. ... "
" ... Put all of these factors together, and you wind up with a significant number of cometary fragments that strike the Earth at extremely high velocities: nearing 100 km/s. The event rate is extremely high at the peak of the Perseids, with meteors approaching or exceeding 100 per hour at maximum. ... "
" ... To wit, the cometary impactor that led to the end of the dinosaurs some 65 million years ago was likely a long-period, high inclination comet. Such high-inclination comets from the Oort Cloud of trillions of comets circle our solar system from all angles at distances of up to a light year. And it’s these that will blindside Earth once more. ... "