How many dwarf planets are there in our solar system? The recent discovery of 2017 OF201 makes the tally anywhere between ...

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

Pluto was long considered our ninth planet, but the International Astronomical Union reclassified Pluto as a dwarf planet in ...

As a dwarf planet, it’s not one of the solar system bodies taught to schoolchildren the way that the eight major planets are.

Although hundreds, or perhaps thousands, more solar system bodies may eventually join the list, the IAU officially recognizes just five dwarf planets at the moment.

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 OF201" by the ...

Our understanding of ring systems says that material orbiting a planet (or a dwarf planet) outside of the Roche Limit should coalesce into a Moon relatively quickly, within a few decades.

Dwarf planets are worlds too small to be considered planets but too large to fall into other categories. Recent observations and discoveries have helped scientists understand planetary systems ...

This is largely because virtually all Earth-like planets discovered within 50 light-years of Earth orbit red dwarf suns.

Ceres, the largest object in the asteroid belt, may hold answers to fundamental questions about the Solar System. This dwarf planet, positioned between Mars and Jupiter, is the only inner Solar ...

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.

Recent telescope data revealed that a small planet in the far reaches of our solar system has a dense ring round it, and scientists are baffled as to why.