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Clearing the neighbourhood
"
Clearing the neighbourhood
around its orbit" is a criterion for a
celestial body
to be considered a
planet
in the
Solar System
. This was one of the three criteria adopted by the
International Astronomical Union
(IAU) in its 2006
definition of planet
. In 2015, a proposal was made to utilise the criterion in extending the definition to
extrasolar planets
.
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