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This is Scientific American 60-Second Space. I'm Steve Mirsky. Got a minute?

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August 24th marks the 25th anniversary of one of NASA's greatest achievements: the first flyby of Neptune.

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At, 2.8 billion miles from the sun, it's the farthest planet ever to pose for a close-up.

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You can thank the Voyager 2 spacecraft for the close encounter.

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Launched in 1977, Voyager 2 sped past Jupiter in 1979, Saturn in 1981, Uranus in 1986 and Neptune in 1989.

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Voyager discovered that a large dark spot marked the face of the giant blue planet.

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It also quadrupled the number of Neptune's known moons from two to eight.

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New discoveries have since raised that number to 14.

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The largest and most intriguing moon of neptune is Triton.

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Voyager discovered that, like Earth, Triton has an atmosphere, mostly of nitrogen.

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The spacecraft also found geysers erupting material that rises five miles above Triton's surface.

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Today, 25 years later, Neptune remains the farthest planet to be visited by a spacecraft.

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But its record will soon be shattered.

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In July 2015, NASA's New Horizons mission zips close to Pluto,

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which will make that distant world the farthest planet yet visited, for those intrepid individuals who still consider Pluto a planet.

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Thanks for the minute, for Scientific American 60-Second Space. I'm Steve Mirsky .

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