Pluto is a large Keiper Belt object. Incomplete information about the solar system made it possible for people to claim it was a planet.
Proposed names for other such objects when found:
DOC
DOPEY
SNEEZY
SLEEPY
HAPPY
GRUMPY
BASHFUL
Proposed names for other such objects when found:
DOC
DOPEY
SNEEZY
SLEEPY
HAPPY
GRUMPY
BASHFUL