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Since there have been no spacecraft probes to fly-by Pluto, and there will not be one until 2015, not much is known about this icy planet. Much of what scientists know are observations made from Charon eclipsing Pluto and Pluto's chance encounter in occulting (covering up) a star. When Pluto occulted a star, a haze was revealed suggesting that Pluto likely has an extremely thin atmosphere. This atmosphere is probably made up of a blend of nitrogen and methane. These elements may exist as a gas when Pluto is closest to the Sun, but would then freeze as Pluto moves further away.

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16y ago

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