Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...

Add Yahoo as a preferred source to see more of our stories on Google. An artist's impression shows the "inside out" planetary system around the star LHS 1903. - ESA An exoplanetary system about 116 ...

Life on Earth is a precious thing, especially given what astronomers know about the visible universe. Although researchers ...

As telescopes have become more powerful, it's turned out our solar system is not the only game in town: There are millions of other planets out there in the galaxy. But we're still teasing out clues ...

Simulations reveal that Jupiter’s rapid growth disrupted the early solar system, creating rings where new planetesimals formed much later than expected. These late-forming bodies match the ages and ...

(CNN) — An exoplanetary system about 116 light-years from Earth could flip the script on how planets form, according to researchers who discovered it using telescopes from NASA and the European Space ...