If all goes as planned, on Sunday morning a bell-shaped space capsule the size of a mini-fridge will come screaming down through the atmosphere toward a Utah desert.

Inside will be some precious cargo: about a cup's worth of rock and dust that a NASA spacecraft collected from an asteroid called Bennu that was, at the time, more than 200 million miles away.

This will be the biggest amount of extraterrestrial material to be brought back to Earth by any nation since the Apollo astronauts hauled home moon rocks, and it's the culmination of NASA's first mission to bring home samples of an asteroid.
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