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

Discovered in 1930 at the Lowell Observatory, Pluto was demoted as a planet in 2006. 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 discovered. They celebrate scientific discovery, history and our solar system’s ...

A new formation theory for Pluto's moon Charon could explain why Pluto is geologically active. Illustration incorporates NASA New Horizons terrain imagery. Pluto — demoted to dwarf planets status in ...

Named for the maiden snatching, shadow dwelling god of the underworld, small but mighty planet Pluto moves into Aquarius for the first time in two and a half centuries on March 23, 2023. Petit but ...

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. The call goes against a controversial ...