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 ...
A four-member crew, including NASA astronauts Sunita "Suni" Williams and Barry "Butch" Wilmore, left the ISS early Tuesday on ...
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