How Long Till We Find Planet 9?

When we were kids at school, we were taught that the solar system had nine planets, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto, but after a few years, Pluto stopped appearing on the list of planets.
Why? And if Pluto is no longer a planet, then what would be planet 9?

8 PLANETS

But summarizing the story, astronomers removed Pluto from the list of planets in the solar system because the definition of “Planet” changed.
But can there be a ninth planet?
THE NINTH PLANET
Following the expulsion of Pluto from the select group of objects classified as planets, the idea that there could be a ninth planet came to light again, especially since such a planet has been searched for years.

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