Good question! According to the Nasa website,
Pluto was re-classified as a dwarf planet in
2006 dwarf planet
In 2003 a group of astronomers observed a Pluto-
sized body orbiting in a cold-icy zone beyond
Neptune; this dwarf-planet became known as Eris.
The observation of this body was confirmed in
2005. A year later, in 2006, the International
Astronomical Union (IAU) met to discuss how
planets should be classified profile for planets
Should Eris become the 10th planet, or
should Pluto lose its planet status? They
decided that Pluto should lose its planet status
and that it should belong new classification of
solar system bodies, known as dwarf planets.
The definition of a dwarf planet is
interesting. According to the IAU, a dwarf
planet is large enough to be round (a sphere)
but not large enough to scatter or attract
objects near their orbits. Planets and dwarf
planets have strong enough gravity that they can
form into a sphere. Smaller bodies, like
asteroids and meteors, are irregularly
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