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

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

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If Kirby Runyon has his way, Pluto will regain its standing as a full-fledged planet. Promoted into the planet club along with it: about 110 miscellaneous rocks, dwarfs and roundish celestial bodies ...

Pluto did in fact both bend and accelerate the trajectory of New Horizons when the spacecraft reconnoitered the dwarf planet in 2015, but only very slightly. There are three reasons the trajectory ...

The search for life beyond Earth has reached a fever pitch, with possible locations to find even microbial life being Mars, Jupiter’s moon Europa, Saturn’s moons Titan and Enceladus, Neptune’s moon ...