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

Neptune’s far-flung moon Nereid may be the last of the planet’s original companions that managed to survive a cosmic crash, ...

For decades, scientists believed that Nereid, Neptune's third-largest moon, was not native to the planet at all.

A study suggests that the ice giant's largest moon, Triton, made a dramatic entrance to the Neptunian system long ago, kicking Nereid outward and destroying the planet's other original lunar companion ...

Astronomers used a telescope in Hawaii to find a new object on the outer edges of our solar system, helping to fuel evidence of a long-standing theory about Planet Nine, or Planet X. For years, ...

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

Scientists have found troubling signs that another Earth — the mysterious Planet Y — may be hiding on the edge of our solar ...

The five dwarf planets recognized by the International Astronomical Union are Pluto, Ceres, Eris, Haumea and Makemake—and these are pictured with 2017 OF201 in a telescope image. Dwarf planets: NASA / ...