For decades, astronomers lumped brown dwarfs into a single category defined by mass alone—too big to be classified as planets but too small to become stars. However, this definition ignores the two ...

Astronomers have characterized a rare 48-Jupiter-mass brown dwarf crossing the face of an unusually massive, aging star, ...

The object orbits a brown dwarf that orbits a star, and astronomers aren’t sure if it’s a planet, a moon — or something else entirely.

Add Yahoo as a preferred source to see more of our stories on Google. Study suggests moons orbiting rogue planets could host liquid oceans for billions of years using tidal heating and hydrogen ...

A Jupiter-mass object appears to be orbiting a brown dwarf in the CD-35 2722 system, potentially becoming the first confirmed ...

A Jupiter-mass object orbiting a brown dwarf could become the first confirmed moon beyond our Solar System.

Astronomers at the University of Hawaiʻi have precisely measured the age of a nearby sun-like star and its unusual companion, known as a brown dwarf, an object that falls between a planet and a star.

A new study based on satellite observations of a brown dwarf orbiting a star suggests the possible first detection of an exomoon. Researchers are debating its classification as an 'exoplanet' or ...

For decades, astronomers have struggled to differentiate giant planets from brown dwarfs, a class of objects more massive than planets but too small to ignite nuclear fusion like true stars. Through a ...

Exomoon discovery: astronomers report the strongest evidence yet for a natural satellite outside our solar system — a Jupiter-mass body orbiting a brown dwarf 73 light-years from Earth, detected using ...