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

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Poor little Pluto.

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In 2006, astronomers ganged up on it and voted to strip it of its planethood, but other astronomers signed a petition saying they'd ignore that vote.

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Now Pluto itself seems to be fighting back.

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Thanks to the Hubble Space Telescope, we've learned that Pluto has at least five moons, pretty impressive for something that's supposedly not a planet.

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And new research suggests Pluto is just we were taught long ago:

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the largest world orbiting the sun beyond Neptune.

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In 2005, astronomers discovered Pluto's greatest rival, Eris.

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It's three times farther from the sun than Pluto.

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And Eris was thought to be bigger than Pluto, too.

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But that initial estimate may have been wrong.

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Other astronomers have now analyzed methane in Pluto's air.

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Yup, Pluto has an atmosphere again, pretty impressive for something that's supposedly not a planet,

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and the methane suggests Pluto is about 1,471 miles across, versus just 1,445 miles across for Eris.

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The new study appears in the journal Icarus.

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We'll find out its exact diameter in July, 2015, when NASA's first spacecraft to Pluto zips by.

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It'll take lots of pictures, probably find more moons, and hopefully tell us whether Pluto is indeed the king of the underworld, I mean, of the solar system beyond Neptune.

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

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