The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.

A decades-old cosmic mystery may finally be solved. Scientists now suspect that the strange X-ray glow from a distant white ...

A surprising chemical difference between Pluto and Sedna, another dwarf planet in the distant Kuiper ... "Since Gonggong is similar in size to Sedna, we believe methane must have escaped from ...

For the better part of a century, we believed there were nine planets in our solar system, with Pluto being the farthest from the sun. Since the discovery of more Pluto-sized dwarf planets, that ...

Such stars are about the same size as a Jupiter-like planet but are more massive, making them much less likely to have been torn apart by the white dwarf. WD 2226-210 has some similarities in X ...

At a distance of just over four light years, Proxima Centauri is our nearest stellar neighbor and is known to be a very ...

NASA discovers four sub-Earth exoplanets orbiting Barnard's Star after a century-long search. Find out how this changes the ...

Scientists found a bizarre new planet named Enaiposha, unlike any in our solar system. Learn why it's a mystery and how it’s ...

Astronomers have discovered four planets that are just a fraction of the mass of Earth orbiting Barnard’s Star, which is 6 ...