Astrophysicist and author Neil deGrasse Tyson explains the theory behind the growing evidence about a possible hidden planet in the Kuiper Belt beyond Neptune.

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its nebular gas had been consumed—Earth's solar system and its planets looked more ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and Earth. The authors dubbed it Planet Y.

Amir Siraj and team propose Planet Y, a possible unseen planet influencing Kuiper Belt object orbits. Vera C. Rubin Observatory may soon shed light on this solar system mystery.

Astronomers have discovered a significant “growth spurt” in a rogue planet outside of our solar system. The free-floating planet is currently consuming gas and dust from its surroundings at a rate of ...

An instrument is set to improve the detection and direct imaging of planets outside our solar system by harnessing the power of liquid crystals. The Programmable Liquid-crystal Active Coronagraphic ...

Exoplanet hunters Christopher Watson and Annelies Mortier explain the long search for a 'twin Earth' capable of sustaining life.

I recall as a child lying on the grass at night, gazing up at the stars, and wondering if any of those distant suns had planets orbiting nearby. I was not ...

ESO's Very Large Telescope has observed a rogue planet and revealed that it is eating up gas and dust from its surroundings at a rate of 6 billion tons a second.

Astronomers believe they may have found a brand new planetary neighbor in our own solar system — Planet Y. Though we haven’t directly seen it yet, its gravitational effects suggest something massive ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. An artist's depiction of 51 Pegasi b, the first exoplanet found orbiting a sunlike star. | Credit ...

Space scientists look back on 30 years of exoplanet discoveries — from rows of massive ‘super-Earths‘ to worlds with perfectly synchronized orbits.