On this day: July 31

POSTED: 08:36 PM PDT Jul 30, 2012    UPDATED: 11:00 PM PDT Jul 30, 2014 

Mt. Fuji erupts, the Apollo 15 astronauts go for a ride, major-league baseball players end their strike, and Michael Phelps swims into Olympic history, all on this day.

OTD July 31 - Lunar Prospector
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NASA

1999: NASA intentionally crashes the Lunar Prospector spacecraft into the moon after the presence of water ice was successfully detected. It was hoped that the impact would liberate water vapor from the suspected ice deposits in the crater and that the plume would be detectable from Earth. However, no such plume was observed.

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