Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for ...

As reports show interest from the White House, NASA seems to be on its way to arguing that Pluto should never have been ...

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” ...

NASA administrator Jared Isaacman declared that Pluto should be restored to its original classification as a planet.

NASA Administrator Jared Isaacman has publicly backed restoring Pluto's planet status, challenging the 2006 International Astronomical Union decision that reclassified it as a dwarf planet. His ...

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 ...

PRAGUE, Czech Republic ” For decades, it’s been confused with a cartoon dog and ridiculed as a puny poser. Now Pluto, the solar system’s consummate cling-on, has suffered its worst humiliation: It’s ...

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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 ...