For reference, Pluto’s average distance from the Sun is about 40 AU, so 2023 KQ14 is quite distant. At 23.4 billion miles (37 ...

Pluto isn't quite as lonely as scientists had thought. Astronomers have discovered another dwarf planet in the Kuiper Belt, the ring of icy objects beyond Neptune. But this newfound world, dubbed ...

It’s not even the biggest: Eris, a dwarf planet in the Kuiper belt that Brown discovered in 2005, is about 25 percent more massive than Pluto. New views on an old discovery ...

In 2006, the International Astronomical Union (IAU) famously demoted Pluto to a dwarf planet. Things have been a bit of a mess since then — so is it time to redefine the planet?

Pluto was once thought to be as big as the Earth. It was regarded as a full-fledged planet for three-quarters of a century, only to be demoted to a new category, "dwarf planet," in 2006.

Because Pluto is so dim, you need a telescope to see it. “A backyard telescope could do it under the right conditions,” says ...

Pluto was demoted to a newly createdcategory, "dwarf planet," in 2006, partly because of the discovery ayear earlier of Eris, another icy body from Pluto's neighborhood.

Now, we know better. Nostalgia for Pluto is really not a very good planet argument, but that’s basically all there is. Now, let’s get on with reality,” Brown wrote on Twitter in May 2018.

On Aug. 24, 2006, the International Astronomical Union voted to downgrade Pluto to a dwarf planet, causing controversy both scientifically and culturally.

On Aug. 24, 2006, the International Astronomical Union voted to downgrade Pluto to a dwarf planet, causing controversy both scientifically and culturally.

On Aug. 24, 2006, the International Astronomical Union voted to downgrade Pluto to a dwarf planet, causing controversy both scientifically and culturally.