There's a whole slew of objects that astronomers aren't sure whether to classify as "failed stars" or "overgrown planets." ...

Brown dwarfs are objects that straddle the dividing line between stars and planets. They form like stars, growing dense enough to collapse under their own gravity, but they never become dense and hot ...

Twirling pair Artist’s impression of Gliese 229Ba and Gliese 229Bb orbiting each other to create Gliese 229B. The brown dwarf pair orbit a cool M-dwarf star (shown in the distance) every 250 years.

Image caption: This discovery image from the Gemini Observatory represents the closest brown dwarf companion ever directly imaged around a star (named LHS 2397a). This image was obtained on Feb. 7, ...

The James Webb Space Telescope zoomed in on extremely faint objects, called brown dwarfs, in the Flame Nebula. Credit: NASA / ESA / CSA / STScI / M. Meyer (University of Michigan) There's a class of ...

Since the solar system formed over 4.5 billion years ago, planets and other objects have been subject to constant change due to heating from the Sun. But a new model developed by researchers from ...