It ceased to be exist as a Planet on August 24, 2006, where a bunch of heartless people who call themselves members of the International Astronomical Union killed it as a planet.
Further more, they suggested a new set of rules to call a celestial object to a planet, it has to clear all the below criteria.
Is in orbit around the Sun
Has sufficient mass for it’s self-gravity to over come rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape
Has cleared the neighborhood around its orbit
Pluto cleared all the criteria, except the last one which became lethal to its existence. "Clearing the neighbourhood" means that the planet has either "vacuumed up" or ejected other large objects in its vicinity of space. In other words, it has achieved gravitational dominance.
Because Pluto shares its orbital neighbourhood with other icy Kuiper Belt Objects, the resolution effectively stripped the distant world of a planetary designation it had held for some 76 years.
And thus Pluto’s existence as a planet came to an END.
However, if you are talking about did Pluto exist as a celestial body? It sure is and is going to stay the same for the next 5 to 7 billion more years until the Sun runs out of hydrogen, gravity will then engulf the sun and the remaining hydrogen will let off its remaining heat at which point the sun will expand and eat up the whole Earth.
Maybe then the farthest part of the Solar System actually receives heat after many millennia and it may be the new habitable zone and life might take a new form in Pluto. You never know!
So Pluto ain’t going anywhere anytime soon!
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