For years, Pluto was viewed as a distant, frozen world whose dramatic landscapes seemed locked in time. A new study published ...

As an astronomer, the question I hear the most is why isn’t Pluto a planet anymore? More than 10 years ago, astronomers famously voted to change Pluto’s classification. But the question still comes up ...

A team of scientists wants Pluto classified as a planet again — along with dozens of similar bodies in the solar system and any found around distant stars. Subscribe to read this story ad-free Get ...

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The heart is pumping nitrogen-dominated air around Pluto, according to a new study. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

ATLANTA -- Pluto, the least of the major celestial bodies, never asked to be a planet. Once elevated, it became an influential figure in astronomy and astrology, in classical music and in cartoons. In ...