Of the more than 5,000 exoplanets that have been confirmed so far and many more thousands of candidates, most orbit stars the ...

WD 1856+534b—a freezing world with a surface temperature of -125 degrees Fahrenheit—exists where planets are normally scoured ...

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

Over the past decade or so, astronomers have speculated about the characteristics of rogue planets in the Milky Way galaxy.

To understand how chaotic the early solar system was, we need only gaze at the moon. Its cratered surface bears the scars of ...

The planet is "crumbling to pieces," shedding the equivalent of Mount Everest’s mass every 30.5-hour orbit and will be ...

providing astronomers with a new way to gauge the mass available for forming planets. "We're seeing evidence of hugely ...

At the center is the sun, a yellow dwarf star that contains 99.8% of the solar system's mass. Everything else — from the eight major planets to dwarf planets, comets, asteroids, and icy objects ...

The JWST continues to live up to its promise by revealing things hidden from other telescopes. One of its lesser-known ...