Donaldjohanson, a main belt asteroid, could be a relic of a cosmic collision that took place 150 million years ago.
Donaldjohanson formed about 150 million years ago when a much larger asteroid broke apart. Since then, its orbit and spin ...
Asteroid Bennu, a 4.5-billion-year-old space rock, may hold clues to Earth's origins. With traces of water, amino acids, and ...
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