Astronomers have finally pinned down both the mass and distance of a solitary “rogue” planet, a world that drifts through space without the warmth or light of a parent star. The object, a Saturn-sized ...

For the first time, astronomers have managed to weigh a planet that is not bound to any star, a lonely world drifting through the Milky Way with no sun of its own. The measurement turns a ...

Scientists now have direct evidence that a planet — not just failed stars — can rove the galaxy after a violent expulsion from its orbit. Credit: NASA / JPL-Caltech / R. Hurt illustration Astronomers ...

Astronomers have observed a planet that in some ways behaves more like a star — including a massive growth spurt unlike anything witnessed before in a free-floating planet. The rogue planet, which ...