Thanks to an enormous stroke of luck and serendipitous timing, astronomers were able to calculate the mass and distance of a ...

In doing so, they found this orphan is within the same weight class as Saturn, strengthening the case that the galaxy teems ...

Astronomers have spotted an Earth-sized planet drifting alone through the Milky Way, detected briefly by bent starlight, ...

Astronomers have finally weighed a wandering “rogue” planet, uncovering a Saturn-mass world flung into the galaxy after a ...

Scientists have discovered a rogue planet roaming the Milky Way after combining observations from Earth and a space telescope ...

While most planets that we are familiar with stick relatively close to their host star in a predictable orbit, some planets ...

Astronomers believe the free-floating planet is around 22 percent the mass of Jupiter and lies 3,000 parsecs from the Milky ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't ...

Jupiter, as always, is a dazzling object, shining among the stars of Gemini the Twins. It reaches opposition on Jan. 10; this ...

Choose your fighter for the origin of water on Earth! Was it always here or did it come to this planet from somewhere else in ...

A young world drifting alone through space is putting on one of the most violent growth spurts astronomers have ever seen, ...