The dwarf planet Eris is one of the most reflective objects in our solar system, astronomers say in a study uncovering a trove of information about the mysterious object beyond Pluto.

How many dwarf planets are there in our solar system? The recent discovery of 2017 OF201 makes the tally anywhere between five and 18, plus hundreds of potentially undiscovered ones, depending on ...

A team of astronomers has discovered a new dwarf planet, and they weren’t even trying to find one. And the discovery, named 2015 RR245 for now, has an unusual, elliptical orbit that takes 700 ...

All 19 detections of the dwarf planet 2017 OF201, from August 2011 to October 2018. Cheng et al., arxiv.org, 2025 ...

If winds on the dwarf planet swirled in a different direction, its landscapes might look completely different." "Sputnik Planitia may be as important for Pluto's climate as the ocean is for Earth ...

A new look through decades-old data has unveiled some of the most compelling evidence yet of a hidden ninth planet in the far reaches of our solar system, far beyond ...

Brown’s discovery of Eris, an icy world in the Kuiper Belt beyond Pluto, led to the reclassification of Pluto as a dwarf planet. He has been dubbed the “Pluto Killer.” ...

Although it is substantially smaller than Pluto, which is 1,477 miles (2,377 km) across, 2017 OF 201 is nevertheless large enough to be classified as a dwarf planet.

Computer simulations led her team to conclude that white dwarf stars—previously considered inhospitable to life-supporting exoplanets—could, in fact, host planets in their habitable zones with ...

Potential discovery of new dwarf planet adds wrinkle to Planet Nine theory By Nick Butler, Fox News Published May 31, 2025, 6:00 a.m. ET ...

Astronomers say a solar system 39 light-years from Earth's harbours seven Earth-sized planets, at least three of which are in the temperature sweet spot where water (and potentially life) is possible ...