Astrophysicists have been grappling with the question of how water arrived on our young planet for decades. One of the ...

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto ...

REx mission found minerals on asteroid Bennu that match California’s Searles Lake, offering clues about ancient water, ...

Planet demographics reveal a puzzling lack of worlds in a certain size range throughout the galaxy F or centuries our solar system was the only planetary system known to humans. We had no proof other ...

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary status.

The controversy endures over Pluto's true status, but the solar system underdog continues to capture hearts across the globe.

Feb. 18 marks the 95th anniversary of the discovery of our outermost planet-not-planet. Here's what to know about the short ...

By looking ever further back in time, the James Webb Space Telescope is at last revealing the first galaxies – and a very ...

Perseverance's drives over the last few weeks have doubled back several times. Why such an unconventional route? Team ...