Because of how Pluto is not a planet anymore...
Planet X is now Planet IX.
(
NERDYLURKER is attempting to divide by zero,
Mon 16 Feb 2009, 17:56,
archived)
this year's highest mover...
it hasn't actually been proven to exist although many would like to think so
(
Mehitabel_Itrang,
Mon 16 Feb 2009, 18:05,
archived)