Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

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.

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.

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.

The dwarf planets in question, Eris and Makemake, are both found in the Kuiper Belt past Neptune's orbit and are far from the Sun's warmth, similar to fellow dwarf planet Pluto.

Pluto, the largest of those dwarf planets, has a diameter of about 1,477 miles (2,377 km). The mass of 2017 OF201 is estimated to be about 20,000 times smaller than Earth's and 50 times smaller ...

Big Number. 4,100. That’s how many kilometers Quaoar’s rings are from the dwarf planet’s core. That puts its rings at a distance of roughly 7.4 of the dwarf planet’s radii from its core ...

Astronomers spotted a potential Earth-size rocky world orbiting a white dwarf, suggesting a future in which our planet outlives its star. By Jonathan O’Callaghan In six billion years the sun ...