At a frigid -125 degrees Fahrenheit (-87 degrees Celsius), WD 1856+534 b is the coldest planet ever directly observed, ...

At the center is the sun, a yellow dwarf star that contains 99. ... in this disk began sticking together, forming planetesimals — the building blocks of planets. Over millions of years, these ...

nor are they quite planets. Astronomers used the powerful James Webb Space Telescope to sleuth out some of these objects, called brown dwarfs, in a vibrant star-forming region of our galaxy called ...