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While Bennu itself is too small to have ever hosted liquid water, the finding indicates that liquid water was present at some time on Bennu's parent body, a much larger asteroid.
Scientists estimate there is a one-in-2,700 chance of the asteroid slamming catastrophically into Earth 166 years from now.
The round, cookie tin-shaped robots successfully reached the Ryugu asteroid a day after they were released from the Hayabusa2 probe.