Debate has raged for two decades over whether Pluto should be considered a planet. Some want President Trump to take action via executive order.

Pluto has long been one of the most debated celestial bodies in our solar system. Once classified as the ninth planet, it was redefined in 2006 as a dwarf planet, a decision that still sparks ...

Hundreds of people who love the little planet that was dissed, gather every year in the Arizona town where Pluto was ...

(MEDIA GENERAL) – As NASA spacecraft New Horizons continues its way through space, scientists and science enthusiasts have taken to social media to express their feelings on Tuesday’s historic Pluto ...

The discovery of another moon around Pluto is exciting news for planetary science, but it's also likely causing some anxiety for the team in charge of New Horizons, a spacecraft set to be the first ...

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Before Pluto was discovered, it was predicted. Astronomers had observed that massive objects can affect the orbits of their neighbors and, after seeing deviations in the orbits of Uranus and Neptune, ...