Neptune has a complicated life story, and its moon Nereid might be the only one left standing from the planet’s ...

Artist's depiction of an extra-solar system that is crowded with giant planets. Massive planets like Jupiter—now at its brightest and best in the night sky—can prevent Earth-sized planets from ...

In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds silently loop around their stars. Some drift as far as 10,000 times the ...

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

A long-ago reshuffling of the giant planets in our solar system may have been instrumental in giving Earth its moon. For decades, planetary scientists have hypothesized that Jupiter, Saturn, ...

Scientists may finally have an answer for why the ferocious jet streams on the solar system’s giant planets blow in opposite directions — eastward on gas giants Jupiter and Saturn, and westward on ...