HOUSTON—Confronted with unexpectedly rocky terrain, NASA’s Osiris-Rex asteroid sample return mission will spend an additional four months assessing its target, the primitive 500-m-wide planetary object Bennu. It will then narrow from four to two the number of prospective landing sites deemed safest to grab a sample of the desired granularity for return to Earth. The primary and backup sites should be known by December.  They should come from four recently selected ...

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