Astronomers studying extreme planetary systems have identified worlds so massive that they rival the smallest stars in size.

Astronomers have discovered an Earth-size planet orbiting an ultracool red dwarf star similar in size to Jupiter. The red dwarf, located some 55 light-years away, is 100 times less bright than the sun ...

Astronomers spotted a potential Earth-size rocky world orbiting a white dwarf, suggesting a future in which our planet outlives its star. By Jonathan O’Callaghan In six billion years the sun will ...

In a significant step forward in the search for distant worlds, astronomers have discovered TOI-1846 b, a newly identified super-Earth exoplanet that may be rich in water. Located just 154 light-years ...

A surprising chemical difference between Pluto and Sedna, another dwarf planet in the distant Kuiper Belt, is helping scientists nail down their respective masses, a new study reports. "Kuiper Belt ...

A regular pattern of debris suggests some kind of a planetary 'shepherd' in the region, scientists say. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

WASHINGTON >> Scientists have identified an object about 435 miles wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it travels on a ...