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

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

To be a planet, NASA says an object must be big enough that its gravity has cleared away any other objects of a similar size near its orbit around the Sun. I can understand how something can clear ...

Preliminary results of a study presented at the recent European Geosciences Union General Assembly in Vienna indicate that ...

A planet that is about the size of Saturn, but with a temperature more like Earth's, has an atmosphere rich in methane, ...

Despite being the closest planet to the sun, Mercury has thick deposits of ice at its poles, and now we may understand the ...

Neptune’s third-largest moon, Nereid, could be an intact survivor from the planet’s original satellite system, upending ...

CAPE CANAVERAL, Fla. — Neptune’s far-flung moon Nereid may be the last of the planet’s original companions that managed to ...

Astronomers using NASA’s James Webb Space Telescope have uncovered a rare world unlike anything in our solar system — a giant planet about the size of Saturn with surprisingly Earth-like temperatures ...

What would it be like to live on a super-Earth?

This goes against the previous theory, which has long suggested that Nereid is actually an object captured from the Kuiper ...