The floating turd mystery that still haunts NASA

During Apollo 10 — in which a crewed spacecraft orbited the moon as a dress rehearsal for the first lunar landing — astronauts encountered a deep mystery. "Oh — who did it?" commander Tom Stafford suddenly asked, six days into the mission, as the crew discussed preparations for leaving the moon's orbit. "Who did what?" inquired command module pilot John Young. "Where did that come from?" interjected lunar module pilot Eugene Cernan.
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