NASA’s Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer (OSIRIS-REx) spacecraft has found water locked inside asteroid Bennu. Bennu is too small to have ever hosted liquid water, but this finding does indicate that liquid water was present at some time on Bennu’s parent body, a much larger asteroid.
OSIRIS-Rex was launched in September 2016 is NASA’s first asteroid sampling mission i.e. it will survey surface, collect sample and deliver it safely back to Earth. It had reached its destination Bennu asteroid in October 2018.
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