astronomer Clyde Tombaugh discovered Pluto.

Tilt is 122.5.

Plutos equator is 1187, and Earths is 7926.

Pluto is a dwarf planet because the're so many other planets just like it, and scientist didnt want to consider every dwarf planet an actual planet. The controvercy is other scientist dissagree because they feel that pluto is different from other dwarf planets.