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

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

Earth has a new neighbor that lives far, far away. Scientists from the Institute for Advanced Study's School of Natural ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

The unusual orbit of a possible dwarf planet, known as 2017 OF201, makes it less likely that our solar system contains a ...

For years, astronomers have been searching for a ninth planet in our solar system (after giving Pluto the old heave-ho and demoting it to a dwarf planet) and now researchers say they’ve found a ...

Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar ...

sitting in the Kuiper Belt - a region in our solar system beyond Neptune filled with icy objects, comets, and dwarf planets like Pluto. Since this hidden planet may be so far away, the new study ...

you’ll find it necessary to include a lot of other dwarf planets. Without a firm lower limit on size or mass, we’re forced to say the solar system has hundreds of planets—maybe thousands.

Dwarf planets may be small, but they offer big clues about the history and evolution of our solar system, continuing to intrigue scientists with each discovery. Photo Credit: NASA 5 things ...

The definition was seen as a demotion of Pluto from the category of planet to the category of dwarf planet ... suddenly it became clear that the Solar System couldn’t keep having nine planets.