For instance, Neptune migrated outward, switching places with Uranus, and pushed a lot of the small, icy bodies into the ...

Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it travels on a highly ...

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

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

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

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.

Curious Kids is a series for children of all ages. If you have a question you'd like an expert to answer, send it to ...

It saw the discovery of dwarf planet Eris and how those very observations ... of dwarf planets and made a lot of people angry. Still, kids in school now learn that the Solar System is not just ...

In 2005, Eris was discovered. It was considered the largest known dwarf planet in the solar system until a year later when Pluto was downgraded from being a planet. In 2008, tribal violence ...

Kids in school are learning about the eight planets and the ... orbiting any star or brown dwarf, and having a mass higher than 10 23 kilograms. Pluto and Eris remain excluded, but maybe it ...

There are five confirmed dwarf planets in the solar system: Ceres, Haumea, Eris, Makemake and the ex-planet Pluto.All of these planetary pretenders, apart from Ceres, are located in or around the ...