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 the European Southern Observatory and his co-authors ...

The probability that one of Saturn’s moons may harbour life has risen, experts say, after finding an array of carbon-based substances being spewed out of Enceladus, the sixth largest of Saturn’s moons. The small moon, one of 274 orbiting Saturn, has ...

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 orbit and no light to receive. For a long time, the ...

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 Dahlbüdding at the Max Planck Institute for ...

Moons drifting through the pitch-black void between stars — orbiting rogue planets with no sun — could sustain liquid water and conditions friendly to life for more than four billion years, according to a study published in February in the Monthly ...

While life on Mars (and Venus) has long been an obsession for those wondering if we're alone, there are other places in our solar system that could support life in some form.