She wrote the song "Planet X" 10 years ago, addressing the possibility that Pluto might be downgraded. In 1996, she read an article in USA Today with the headline "Demoting Pluto Is Just Asking ...

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why Pluto isn't a planet.

Why did Pluto lose its planet status? It was actually the discovery of 2003 UB313—now called Eris—in 2005 that led to Pluto being reclassified. Eris has a lot more mass than Pluto, so at its ...

But New Horizons is about to lift the veil on Pluto and its five known moons. During next month's close encounter, the probe will zoom within just 7,800 miles (12,500 kilometers) of the dwarf ...

Pluto's status has been a heated debate for decades with arguing over a dwarf planet classification. Here's what international standards say in 2023.

Pluto was once considered the ninth planet in the solar system. It was demoted in 2006. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works ...

Did Pluto ever actually stop being a planet? Experts debate. It’s been 18 years since Pluto’s celestial status was called into question—yet the matter seems far from settled.

Pluto, therefore, is not the gravitationally dominant object in its neighborhood — and thus, not a planet, according to the new definition. Sign up for the Live Science daily newsletter now ...

Nevertheless, because it orbited the Sun like a planet, it was classified as a planet and named Pluto, after the god of outer darkness in Roman mythology. So things stood for 65 years.