Pluto moon 'has no atmosphere'

A rare astronomical event has allowed scientists to show that Pluto's moon - known as Charon - has no atmosphere. This could dismiss claims Charon is a planet twinned with Pluto and provide further insight into their formation. Two groups of scientists made observations of the moon as it eclipsed a distant star in the July of 2005.


 Moon planet Pluto Charon atmosphere

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