Article: Pluto and Charon, the odd couple

Eighteen years ago this month, Jim Christy - an astronomer at the US Naval Observatory in Washington - found that what looked looked like a pear-shaped Pluto was in fact the combination of two bodies - Pluto, and its hitherto undiscovered moon. He named his discovery Charon - not after the ferryman who transported souls across the River Styx to Pluto's Underworld, but after his wife, Charlene. Those in the know pronounce it "Sharon", instead of the classical "Kar-on".

The discovery of Charon cleared up one mystery about Pluto - its mass. Astronomers believed they had originally tracked the planet down as a result of its gravitational pull on Uranus and Neptune. But observations of the ...

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