the.com/planetary definition
the cosmic bouncer that kicked pluto out of the club in 2006.
means the official iau rule stating a planet must orbit the sun, be round from its own gravity, and clear its orbital neighborhood of other debris.
from drafted by the international astronomical union in 2006 after astronomers kept finding pluto-sized objects in the outer solar system, forcing them to decide what actually counts as a planet before the list grew to hundreds.
pluto casualtyreclassified as dwarf planet same year
the culpritdiscovery of eris, a pluto rival, forced the vote
the loopholeclearing your orbit favors big planets near the sun
still debatedmany astronomers reject the definition outright