Planets

Look east before dawn on Wednesday, Aug. 14, to see the giant planet and the Red Planet just a third of a degree from one another in a rare planetary conjunction.

Scientists examining data from NASA's InSight Lander have revealed the likely presence of an underground reservoir containing enough liquid to cover the planet with a mile of water.

This stunning image of dune fields near Mars' north polar ice cap, taken by NASA's Mars Reconnaissance Orbiter, showcases the impact of polar winds on the Red Planet's landscape.

Astronomers using the James Webb Space Telescope have found that Ariel, a moon of Uranus, has some of the most carbon dioxide-rich deposits in the solar system, hinting at a buried water ocean.

New simulations suggest that a 9-mile-thick layer of solid diamonds may lurk deep below the surface of Mercury. The gems almost certainly can't be mined for bling — but they may help solve some of the planet's biggest mysteries.

Vivid clouds swirl across Jupiter's skies like colorful brushstrokes in a new photo from NASA's Juno spacecraft.

A peculiar leopard-spotted rock, found beside an ancient, dried-out river in Mars' Jezero crater, contains some tantalizing clues of ancient life, NASA said.

NASA's Curiosity rover revealed an 'oasis' of rare elemental sulfur on Mars after accidentally crushing a rock with its tires. The yellow crystals have never been spotted on the Red Planet before.

Astronomers are proposing a new, more quantitative definition of what makes a planet. The new definition looks more directly at the object's mass — but it would still leave Pluto out of the running.