For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

In searching for the elusive Planet Nine, researchers instead turned up a different resident in our cosmic backyard.

Plus, an in-depth look at how the West Texas city of Seminole reacted when a measles outbreak tore through the region.

Astronomers confirm TOI-5573 b, a rare, miniature Saturn-like planet orbiting a small star, challenging theories of planetary ...

TOI-6894 b, the largest exoplanet relative to its host star yet seen, doesn’t fit the most widely accepted formation model ...

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 years to complete one orbit around the sun. The object, known as 2017 OF201, ...

In 2006, updated research led to Pluto being controversially demoted to dwarf planet status by the International Astronomical Union. The reasoning was that Pluto's location in the far-flung Trans ...

Jupiter-like planet 8 UMi b, named Halla, orbits its host red giant star Baekdu closely. The red giant's merger with a white ...

The James Webb Space Telescope has discovered an exoplanet using the direct-imaging technique. The host star's light was ...

Scientists using the James Webb Space Telescope may have directly imaged a Saturn-mass planet orbiting the young star TWA 7.