Why is Pluto not a planet

Question

Like why is it not included in solar system i don’t get it

In: 20

Answer 1

In 2005 astronomers discovered another one, an object now called Eris.

And then another.

And another.

And another.

It quickly became apparent that there’s a vast sphere of these glorified comets out there in all sorts of wacky orbits. Pluto isn’t even the biggest one.

So this raised a conundrum – do we add dozens of new planets every few years when another wayward ice ball crosses a telescope, or does Pluto get demoted?

Eventually we decided to redefine “planet” to exclude Pluto because it obviously hasn’t cleared all the junk out of its orbit.