The Story Of Pluto When a planet is no longer a planet
Ptolemy said that Earth was the center of our solar system. Copernicus then discovered that the Sun was the center of our solar system. Kepler realized that all the planets had an oval orbit around the sun.
Did you hear that Lowell discovered that Neptune wobbles in it's orbit. He thinks it is because of another planet.
Newton discovered that gravity holds planets in their orbit.
Piazzi discovered Ceres. They thought it was a planet but it was demoted to an asteroid.
Herschel discovered the asteroid belt and that asteroids travel in it
Pluto got demoted because he was too small. Although he was big enough to be circular, he couldn't clear everything out of his neighborhood with his gravitational pull.
His moon was also almost the same size as him. That is not a good thing.
Next thing we knew...Pluto grew extremely huge and pulled everything in our solar system together to make a planet pangea instead of a continent pangea!!