The cast of exoplanets has an extraordinary new member. Using ESO’s telescopes, astronomers have discovered an approximately seven- Jupiter-mass companion to an object that is itself only twice as ...

Scientists using a global array of radio telescopes have detected the universe’s lowest-mass dark object by observing how it warped light through gravitational lensing. The invisible mass, about a ...

"Planetary-mass objects don't fit neatly into existing categories of stars or planets." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Are they ...

Although mass is the most important property of stars, it has proved very hard to measure for the lowest mass objects in the universe. Thanks to a powerful new camera, a very rare, low-mass companion ...

Astronomers have finally pinned down the mass and distance of a lonely world that drifts through the galaxy without a parent star, a feat that turns a once-theoretical class of objects into a ...