Neptune's mysterious, far-flung moon Nereid may be the last of the planet's original companions. Scientists at the California ...

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

You may not think much about ice until you need it and are out. Many refrigerators offer a supply of crescent-shaped cubes ...

Uranus and Neptune may contain rocky atmospheres, with new research challenging long-held ice giant identity.