Our solar system may have a ninth planet -- or a tenth, if you're a Pluto sentimentalist. Tyche, which astronomers suspect lurks in the Oort cloud, fifteen thousand times farther away from the sun than the Earth, is thought to be a gas giant four times the size of Jupiter. We may know for sure in April.
posted by eugenen on Feb 14, 2011 - 99 comments

People have been upset about Pluto's demotion for some time now. (While classical music fans have just had a love/hate relationship with this whole process.) But astronomical hate mail has never been as cute as the missives Neil deGrasse Tyson has received over the years from tots upset at poor Pluto's ouster.
posted by greekphilosophy on Mar 15, 2010 - 46 comments

Venetia Phair, who named Pluto as a child, dies at 90. [more inside]
posted by Morrigan on May 11, 2009 - 54 comments

SAVE PLUTO
posted by thirteenkiller on Aug 25, 2006 - 91 comments