The possibility that an additional planet may be hidden far into the solar system was touted more than a century ago. In 1983 ...

Astronomer Eliza Kempton said that she had waited her "entire career" to peer into an atmosphere from this mysterious class of planets.

A dazzling snapshot from ESO’s Paranal Observatory captures a rare sky parade — the Moon, a comet, and nearly every visible ...

Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home. The solar system is our cosmic neighborhood, made up of ...

The Webb telescope has spotted exoplanets circling white dwarf stars, proving that planets can survive their star’s violent endgame.

An Egyptian sarcophagus shows the sky goddess Nut as being covered in stars and having a dark, undulating curve running ...

NASA’s Nancy Grace Roman Space Telescope is gearing up to unlock the deepest secrets of the universe with three ...

but the new definition of a planet requires the celestial body to have enough gravity to clear its orbital path from other bodies. MORE: Binary star system found near the Milky Way's black hole ...