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

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

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

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

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 ...

Stars have long inspired curiosity among observers, but our understanding of their birth and the creation of planets around ...

When a star is born, it doesn’t emerge in isolation. Instead, it forms inside a large, chaotic cloud of gas and dust. Around ...