To be fair, Pluto had it coming. The word "planet" never had an official definition, and astronomers had always played fast ...

According to Dr. Grundy, Pluto is a planet. "I use the word 'planet' to refer to it, and most of the planetary science community does too," Grundy said. "Pluto's got everything I like in a planet ...

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...

Conveniently, the word also contained Percival Lowell’s initials. And so on May 1, Lowell Observatory announced that Planet X would be named Pluto. But with its peculiar, tilted orbit and ...