For decades, the solar system set the template: small rocky planets close to the star, gas giants farther out, beyond a ...

The familiar concept of a planetary core, a small, dense metallic heart we take for granted, may be the exception rather than ...

A dense metallic core, a silicate mantle, and a thin atmosphere on top—this familiar internal structure of rocky planets may ...

Scientists have discovered a bizarre planetary system where a rocky world orbits farther out than giant gas planets, defying ...

Astronomers have spotted an unusual planetary system with a rebellious rocky planet orbiting well beyond where it would be expected to form. And in the newly spotted system of four planets, the first ...

Astronomers have found a planetary system that seems to have formed inside-out. While most systems, like our own, have rocky planets closest to their star and gaseous ones further out, the LHS 1903 ...

Alpha Centauri, one of the two "Pointer Stars" that help stargazers find the Southern Cross in the Southern Hemisphere, may have a planet in orbit around it. If it does, the Webb Telescope will find ...

Mars is the fourth planet from the sun and has a distinct rusty red appearance and two unusual moons. The Red Planet is a ...