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 ...

Curious Kids is a series for children of all ages. Have a question you’d like an expert to answer? Send it to CuriousKidsCanada@theconversation.com.. Why does it matter if Pluto is a planet or a ...

Now, Pluto is one of five dwarf planets recognized by the IAU, and plenty more objects will likely earn that designation. “Kids were worried that Pluto was disappointed,” DeVorkin says.

Planetary scientist Alan Stern, one of the most ardent defenders of Pluto's planethood, has no problem with calling the icy world a "dwarf planet." What he does have a problem with is the idea ...

But Pluto turned out to be too tiny — it is smaller than the moon — and was demoted to dwarf planet status in 2006. There are now four other officially recognized dwarf planets, and Cheng ...

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.

Scientists in Michigan have found a new dwarf planet in our solar system. It's about 330 miles across and some 8.5 billion miles from the sun. It takes 1,100 years to complete one orbit.

Orbiting a tiny planet at the far reaches of our solar system is an even tinier, pitch-black moon, NASA’s Hubble telescope has revealed. The moon – nicknamed MK2 – orbits Makemake, the ...

Scientists found a possible new dwarf planet — it could spell bad news for Planet 9 fans Pluto's hazy skies are making the dwarf planet even colder, James Webb Space Telescope finds ...