At the very edge of our solar system, beyond the grasp of Neptune and even past the icy sprawl of Pluto’s domain, a new ...

New models show Eris is behaving less like a solid, rocky world and more like "soft cheese." Close to 18 years ago, astronomers spotted a miniature, icy world named Eris billions of miles beyond ...

Learn about the recently discovered trans-Neptunian object that may eventually join Pluto as a dwarf planet, found at the ...

The dwarf planets of Eris and Makemake, situated in the Kuiper Belt beyond the orbit of Neptune, may have geothermal activity beneath their surfaces, according to two new papers in the journal Icarus.

Few talk about dwarf planets or moons ... thought to be larger than Pluto and it had been thought that Eris could officially get planet-status at the IAU meeting. However, with several other ...

We used that to discover these biggest, brightest, dwarf-est planets that are out there, including the one that really forced a discussion about Pluto. We discovered Eris, which is more massive ...

In fact, Ceres makes up 25% of the total mass of the asteroid belt. Still, Ceres remains a dwarf planet. Perhaps as it should, given Pluto's relegation to dwarf planet — Pluto is 14 times larger ...