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 ...

1.89 to 2.4 times the mass of Jupiter, our solar system’s largest world. (U.C. Berkeley and San Francisco State University). Marcy’s group discovered a smaller planet closer to Gliese 876 a year later ...

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.

Astronomers have finally pinned down the mass and distance of a lonely world that drifts through the galaxy without a parent star, a feat that turns a once-theoretical class of objects into a ...

The largest survey of exoplanets using an observatory atop Mauna Kea on the Big Island confirms a long-predicted relationship ...

An artist’s depiction shows a planet bending and magnifying the light of a distant background star through gravitational lensing. (Image: J. Skowron, K. Ulaczyk/OGLE) Astronomers have, for the first ...

NASA and the National Science Foundation funded a new instrument called NEID. NEID is designed to help scientists to measure the masses of planets that are outside of our solar system. The tool ...

Astronomers have detected a rogue planet with a mass similar to that of Saturn. Using observations from both ground-based telescopes and space instruments, they were able to measure the planet's size ...