Might the solar system harbor not just one, but two unknown planets? A fresh study of the Kuiper Belt’s structure has revived that far-out question, pointing to a possible Earth-sized world-nicknamed ...

The asteroid impact that wiped out the dinosaurs 66 million years ago may have helped create conditions for ants to diversify ...

A new study suggests that our solar system’s smallest planet has shrunk by up to 30 percent since its birth roughly 4.5 billion years ago ...

Add Yahoo as a preferred source to see more of our stories on Google. An artist's concept shows what K2-18b might look like. Thought to be covered entirely in liquid water with a hydrogen-rich ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. New research has cast doubt on the long-held belief that Saturn's rings ...

Stellar detectives have identified seven stars that recently dined on a rocky planet. The study doubles the number of binary stars known to have consumed a planet, and questions the perception that ...

The peer-reviewed study, "The Earth4All scenarios: Human well-being on a finite planet towards 2100," uses a system dynamics-based modeling approach to explore two future scenarios: Too Little Too ...

A planet thought to orbit the star 40 Eridani A—host to Mr. Spock's fictional home planet, Vulcan, in the "Star Trek" universe—is really a kind of astronomical illusion caused by the pulses and ...