Collisions in the main asteroid belt send rocky fragments flying haphazardly through space
WASHINGTON - Meteorites - rocks that fall to Earth from space - have pelted our planet from its birth about 4.5 billion years ago to today, often causing scant damage but sometimes triggering cataclysms. But from where exactly are these space rocks coming? New research has the answer.
As part of the research, the astronomers carried out numerical simulations that enabled them to model the formation and evolution of families of asteroids orbiting the sun in the main asteroid belt. "While more than 70,000 meteorites are known, only 6% had been clearly identified by their composition as coming from the moon, Mars, or Vesta, one of the largest asteroids in the main asteroid belt.
The Karin family, formed 5.8 million years ago, and the Koronis family, formed 7.6 million years ago, account for a class of meteorites called H chondrites that represent 33% of known Earth meteorites, it showed. The new research did not look at the source of the one that struck Earth 66 million years ago that wiped out the dinosaurs, aside from their bird descendants, and enabled mammals to become dominant.
پاکستان تازہ ترین خبریں, پاکستان عنوانات
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