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.

Despite no longer being a planet, Pluto is still loved by millions around the world. And, for a good reason, it is a fascinating object. With a surface covered with mountains, valleys, plains ...

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 ...

One of the latest mysteries captivating scientists and space enthusiasts alike is the potential discovery of a ninth planet ...

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Here's what to know about the short life of what was, for a single human lifetime, the solar system's smallest planet. Pluto was discovered in 1930 by Clyde Tombaugh, an American astronomer at the ...