also breaking down some of the gasses in this larger asteroid; as that's pretty much all they are ( big pieces of frozen gas and junk). Add in gravitational forces between the Earth and Moon, and it explains for it fragmenting.
IMO there will be quite a few more incidents of large meteor strikings. I'd imagine the likely hood of larger ones to increase as the closer the big asteroid gets to earth. Hope nothing drastic comes of this.
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