Picture a planet hurtling through interstellar space with no star to warm it, flung from its birthplace by a gravitational ...

Rogue planet moons habitable for 4.3 billion years without any star? A new LMU and Max Planck Institute study shows tidal ...

Provided they host thick, hydrogen-dominated atmospheres, moons orbiting free-floating exoplanets could retain much of the heat generated deep within their interiors by tidal forces. Led by David ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't been for lack of trying. According to a new paper by Thomas Winterhalder of ...

There is a category of planet that belongs to no star. It was thrown clear of its solar system early in the chaos of planetary formation, sent drifting into the galaxy’s cold interior with no sun to ...

CAPE CANAVERAL, Fla. (AP) — Scientists have uncovered new types of organics in icy geysers spouting from Saturn’s moon Enceladus, bolstering the likelihood that the ocean world may harbor conditions ...

A team of scientists has confirmed that the nearby star GJ 887 hosts at least four planets, one of which could be a habitable world — the second closest to our own solar system. RELATED: Animal life ...