For many people, the definition of a planet was only made clear in 2006, when the spunky world Pluto was demoted from a planet to a dwarf planet. Now, a team of astronomers is pushing for “planet” ...

The bill treats a complex cluster of biological traits as if it were one settled thing, and ties legal meaning to the ...

NASA chief Jared Isaacman’s call to restore Pluto’s planetary status has reignited a long-running scientific debate over whether the icy world was unfairly demoted from the solar system’s official ...

PRAGUE, Czech Republic – Pluto, beloved by some as a cosmic underdog but scorned by astronomers who considered it too dinky and distant, was unceremoniously stripped of its status as a planet Thursday ...

Hey, remember Pluto? Of course you do! When most of us were brought up in school we learned that there were nine known planets in the Solar System, and Pluto was the one that hung out on the outskirts ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. In 2006, the International ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: NASA/Johns Hopkins ...

Maybe Pluto is a planet after all. The icy ball at the outer edge of the solar system was considered a planet from its discovery in 1930 until 2006, when a global astronomy organization made the ...

Scientists have spent 12 years arguing over how to classify Pluto, and a recently published paper offers a new — but surprisingly old — reason for restoring the object's planetary status. The new ...