For centuries, astronomers have sought to understand the formation and evolution of the solar system and the dynamics that ...

The International Astronomical Union’s Minor Planet Center, which catalogs new moons and other small bodies in the solar ...

OF201 is incredibly lightweight on a cosmic scale. Scientists estimate its mass is about 20,000 times less than Earth’s and ...

Star TOI-6894 is just like many in our galaxy, a small red dwarf, and only ~20% of the mass of our sun. Like many small stars ...

The discovery of the exoplanet, a super-Earth called Kepler-735c, is all down to something called transit timing variations, ...

A pair of new studies has revealed that the hellish skies of exoplanet WASP-121b contain silicon monoxide gas, which has ...

For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, ...

Read Two views of the planet Uranus appear side-by-side for comparison. At the top, left corner of the left image is a ...

For comparison, Pluto makes a lap around ... A composite image displays the five recognized dwarf planets in the solar system, as well as the new candidate 2017 OF201. Credit: NASA / JPL-Caltech ...

OF201, a possible dwarf planet with a 25,000-year orbit, challenging theories about Planet Nine and the solar system’s edge.

On May 21, the International Astronomical Union's Minor Planet Center announced the discovery of 2017 OF201, which, because of its distance beyond Neptune, is classified as a trans-Neptunian object ...

As explained in a pre-press paper [PDF] titled “Discovery of a dwarf planet candidate in an extremely wide orbit: 2017 OF201” ...