Here's why:
* The definition of a planet changed: The International Astronomical Union (IAU) redefined the term "planet" in 2006. The new definition required a celestial body to:
* Orbit the Sun
* Be massive enough to be round due to its own gravity
* Have cleared its orbital neighborhood of other objects.
* Pluto didn't meet the new criteria: Pluto shares its orbital space with many other icy bodies in the Kuiper Belt. This led to its reclassification.
It's important to note:
* Pluto is still a fascinating and important celestial body, even if it's not classified as a planet anymore.
* There's an ongoing debate about the definition of a planet, and some scientists argue that Pluto should be reinstated.
So, while Pluto's status changed, it didn't disappear or lose its significance. It remains a fascinating object in our solar system.
