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" ... A fragment from a large, long-period comet, pushed into a sun-grazing orbit by Jupiter, was likely the source of the impactor that slammed into the Gulf of Mexico some 66 million years ago, researchers now say. ... "
" ... Which is excellent, because that’s precisely what we intended to do. There are a series of mysteries we’re hoping to answer about our early Solar System, and the Hayabusa-2 mission is an incredible scientific opportunity. What we did was send Hayabusa-2 about 300 million km away — about twice the Earth-Sun distance — into the asteroid belt, where it encountered asteroid Ryugu. After collecting surface dust, Hayabusa-2 fired an impactor into the asteroid, kicking up pristine, sub-surface material, which it also collected. Both sets of material were returned safely back on Earth, where they have now been recovered and await analysis. ... "
" ... “A surviving fragment of the Chicxulub impactor is similar to meteoritic fragments of asteroids and does not resemble the one sample we have from a comet,” Kring told me. Moreover, Kring says that chemical traces of the impactor in debris ejected from the Chicxulub crater resemble the chemical compositions of known meteoritic fragments of asteroids. ... "