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A commercial spacecraft carrying NASA experiments successfully touched down on the moon's surface early Sunday morning, ushering in a new phase of private space exploration.

Everyone knows about Apollo 11, the first moon landing. And about ill-fated Apollo 13. Between them is the forgotten mission — Apollo 12.

July 20 marks the 50th anniversary of the first humans on the moon. Astronauts got there aboard the Apollo spacecraft designed just for that purpose.…