Pluto the planet came first. Pluto the pup made is debut in the Disney cartoon "The Chain Gang" in 1930, but was unnamed. Mickey's canine pal woudn't be callled Pluto until the following year.

If you answered "Pluto's planethood," your grasp of the astronomical is excellent. Feb. 18 marks the 95th anniversary of the discovery of our outermost planet-not-planet. Here's what to know about ...

After passing in the state senate, a new bill that would officially designate Pluto as Arizona's state planet is now at the will of Gov. Katie Hobbs. Since its discovery in Flagstaff, Pluto has ...