Using a decades-old technique, astronomers have precisely measured the mass of a planet outside our solar system. The measurement reveals that the unseen planet, which orbits a star just 15 ...

Add Yahoo as a preferred source to see more of our stories on Google. Not all planets are lucky enough to live in a neighborhood like our Solar System – some are doomed to roam the cosmos alone.

The planets in our galaxy are surrounded by stars and other celestial bodies, unlike some distant and isolated planets in space. Quite far beyond the Milky Way is a lone planet that astronomers found ...

A giant planet in the HR 8799 system orbits six times faster than its neighbor, reigniting the mystery surrounding its origin ...

A team of astronomers has measured the mass and size of a Mars-sized planet orbiting a red dwarf star about 200 light years from our solar system. The planet, named Kepler-138b, is the first exoplanet ...

Determining the size of an Earth-size exoplanet by the amount of starlight it blocks hundreds of light-years away once was the realm of science fiction. Measuring the mass of such a small planet based ...

Planet Nine has seen its share of headlines lately, but its newfound popularity is also bringing back theories that the yet-to-be-discovered planet may have affected, and may in the future affect, ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Astronomers have discovered an Earth-mass planet very close ...

A research group is reporting the detection of extragalactic planet-mass objects in a second and third galaxy beyond the Milky Way after the first detection in 2018. With the existing observational ...