A bizarre, ultra-light planet is cloaked in such a thick haze that even JWST can’t reveal its composition. Its unusual size and orbit are forcing scientists to rethink how planets form.

Jupiter Icy Moons Explorer (JUICE) probe is on its (very long) way to Jupiter, and will finally arrive at the King of Planets ...

The James Webb Space Telescope reveals active volcanoes on Io in unprecedented detail thanks to an innovative technique.

This month's new moon occurs at 9:23 p.m. EDT on March 18 (0223 GMT on March 19) as the lunar disk passes between the sun and Earth. Around this time, the lunar disk is invisible from our perspective, ...

A hazy, ultra-light “super-puff” planet, Kepler-51d, is hiding its secrets and challenging how scientists understand planet formation.

A massive crater on asteroid Psyche may hold the key to whether it’s a lost planet’s core or something more complex. New simulations suggest NASA’s upcoming mission could finally solve the mystery.

Discovered in 1930 at the Lowell Observatory, Pluto was demoted as a planet in 2006. Some want President Trump to take action via executive order.

It's one of those weeks when the stars and planets are getting frisky! Lots is happening, so pay attention! Mercury ...

The updated measurements won't take away Jupiter's status as the solar system's biggest planet. NASA / JPL-Caltech / SwRI / MSSS Scientists may have been overestimating the size of the solar system’s ...

For over 50 years, we thought we knew the size and shape of Jupiter, the solar system's largest planet. Now, Weizmann Institute of Science researchers have revised that knowledge using new data and ...

The solar system’s most giant planet is slightly less of a giant than scientists once thought. Jupiter, a world that is so huge that it could hold 1,000 Earths, is eight kilometers narrower in width ...