How Was the Moon Made? We Won’t Know Until We Go Back

By Rebecca Boyle David Scott and James Irwin traveled to the moon with a shopping list. Geologists wanted the two men, Apollo 15 astronauts, to collect samples that would shed light on the moon’s mysterious formation and early years. On their second day there, Aug. 1, 1971, Mr. Scott and Mr. Irwin hit the jackpot. …