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1 .This is Scientific American 60-Second Space. I'm Steve Mirsky. Got a minute?
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2 .August 24th marks the 25th anniversary of one of NASA's greatest achievements: the first flyby of Neptune.
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3 .At, 2.8 billion miles from the sun, it's the farthest planet ever to pose for a close-up.
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4 .You can thank the Voyager 2 spacecraft for the close encounter.
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5 .Launched in 1977, Voyager 2 sped past Jupiter in 1979, Saturn in 1981, Uranus in 1986 and Neptune in 1989.
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6 .Voyager discovered that a large dark spot marked the face of the giant blue planet.
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7 .It also quadrupled the number of Neptune's known moons from two to eight.
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8 .New discoveries have since raised that number to 14.
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9 .The largest and most intriguing moon of neptune is Triton.
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10 .Voyager discovered that, like Earth, Triton has an atmosphere, mostly of nitrogen.
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11 .The spacecraft also found geysers erupting material that rises five miles above Triton's surface.
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12 .Today, 25 years later, Neptune remains the farthest planet to be visited by a spacecraft.
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13 .But its record will soon be shattered.
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14 .In July 2015, NASA's New Horizons mission zips close to Pluto,
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15 .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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16 .Thanks for the minute, for Scientific American 60-Second Space. I'm Steve Mirsky .
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