Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory about the possibility of a giant ninth planet. The dwarf planet's existence ...

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.

A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

Dwarf planets are smaller planets that do not meet all three categories of a planet. According to NASA, they are round in shape and orbit the sun, but don’t clear their orbital path.

The dwarf planet also has one provisional moon, which is nicknamed MK 2. Discovery: March 31, 2005. Size: 888 miles in diameter (1/9 the size of Earth) Distance from sun: 4.3 billion miles.

With this structure, the dwarf planet would get gradually muddier and less frozen at lower depths. A NASA spacecraft got a closer look at Ceres' surface between 2015 and 2018 through the ...

On the other hand, if you’re nostalgic (and a tad antiestablishment), there are still nine now, but then, to be fair, you’d have to include the so-called dwarf planets, in which case there may ...

Just on the outskirts of our solar system exists the dwarf planet Quaoar, and recent observations of the planet found a dense ring around it, but scientists can't figure how – or why – it's there.

Dwarf planets are big this month. Writing for Space.com, Starry Night Education's Geoff Gaherty points out that two of the best-known dwarf planets, Pluto and Ceres, are in prime positions for ...

All 19 detections of the dwarf planet 2017 OF201, from August 2011 to October 2018. Credit... Cheng et al., arxiv.org, 2025 ...

The ring in question orbits Quaoar, a small dwarf planet that lies more than 4 billion miles from the sun—roughly 44 times the distance between Earth and our star.