In 2006,the International Astronomical Union produced a major announcement concerning Pluto.What was it?
A) Liquid water has been found on its surface.
B) Pluto has a moon named Charon that is nearly as large as Pluto itself.
C) Pluto has been officially demoted from its former status as one of nine major planets in our solar system.
D) Chemical signatures in rocks recovered from Pluto by NASA astronauts suggest that it may be inhabited.
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