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Concerning the Apollo rocket’s third stage returning to Earth orbit: How did the researchers determine the source to be Apollo 12, since there were six other Apollo moon missions? Did they use some fancy orbital mechanics along with statistical probability?

George Richeson
Brenham, Texas

Yes, they did, and the orbit matched. Also, the researchers found no evidence of the object in images that had been taken before the launch of Apollo 12 .–R. Cowen