Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

despite the semantics around its classification. "I personally think Pluto is a planet and it has nothing to do with the fact ...

The newly discovered object, named 2017 OF201, has a 25,000-year orbit and is believed to be a large contender for dwarf ...

Pluto had been considered the ninth planet since its discovery in 1930 ... instead of a better classification that would have greatly increased the number of planets, he said.

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...

Why Pluto Doesn't Fit "Pluto is a dwarf planet. So be it — it's a classification," says Thierry Montmerle, the group's general secretary. "It's not a demotion or a promotion." He says Pluto ...

When this happened, Alan Stern, the principal investigator behind the New Horizons Pluto fly-by mission, was not very amused. Our current classification system of what makes a planet a planet just ...

Pluto should be reclassified as a planet ... Instead, Metzger recommends a planet classification based on whether it is sufficiently large so that its gravity allows it to become spherical ...

"It just makes no sense from a classification standpoint to ... The only reason Pluto was ever deemed a planet, Brown added, is because it was first detected so long ago, before people realized ...

Alison Klesman, senior editor, Astronomy: To me, Pluto is not a planet — and that’s a sign of progress. Classification and nomenclature in science is admittedly often arbitrary, but the idea ...