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On Sept. 3, 2006, a European satellite named SMART-1 crashed into the moon! [‘On This Day in Space’ Video Series on Space.com]

This wasn't actually as disastrous as it sounds, because the spacecraft did it on purpose. SMART-1 launched in 2003 and was the first European spacecraft to go to the moon. It was also the first mission of a program called Small Missions for Advanced Research in Technology, which was a series of low-cost spacecraft that the European Space Agency launched to test new spaceflight technologies.
SMART-1's primary objective was to do a flight test something called Solar Electric Primary Propulsion, or a solar-powered electric engine. While it orbited the moon for almost two years, it looked for water ice and other chemicals on the lunar surface.
When it slammed into the moon, that was also done for science. Astronomers back on Earth watched the impact with their telescopes, hoping that it would give them some insight into the mechanics of meteor impacts.

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Transcript
00:00On this day in space. In 2006 a European satellite named Smart One crashed into
00:07the moon. This wasn't actually as disastrous as it sounds because the
00:11spacecraft did it on purpose. Smart One launched in 2003 and was the first
00:15European spacecraft to go to the moon. It was also the first mission of a program
00:19called Small Missions for Advanced Research and Technology, which was a
00:22series of low-cost spacecraft that the European Space Agency launched to test
00:26new spaceflight technologies. Smart One's primary objective was to do a flight
00:30test of something called solar electric primary propulsion or solar-powered
00:34electric engine. While it orbited the moon for almost two years, it looked for water,
00:38ice, and other chemicals on the lunar surface. When it slammed into the moon,
00:42that was also for science. Astronomers back on Earth watched the impact with their
00:46telescopes, hoping that it would give them some insight into the mechanics of
00:49meteor impacts. And that's what happened on this day in space.
00:56I think that when the meteorologist was ready, it was a great show.
00:58thebournes are there. But the meteorologistiettel on Earth is probably
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