What is Planet Nine, and where is it? The question has fascinated astronomers for years. Scientists believe a massive ...

Astronomers have spent years searching for a possible hidden giant planet far beyond Neptune. Unusual orbits among distant ...

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 ...

A chemical engineer noticed that the spectra of the hazy atmosphere of mini-Neptune planets looked like the soot produced by ...

Neptune’s oddball moon Nereid may be the sole remnant of an earlier system, formed near the planet rather than being pulled in from afar.

Astronomers have been puzzling over a mystery on Neptune, and now they think they have unlocked its secret. The ice giant's ghostly, cirrus-like clouds largely disappeared four years ago. Today, just ...

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

Using data from the Webb space telescope, a team of researchers is suggesting that Neptune’s moon Nereid is the only survivor of the ancient lunar collision that rewrote the history of the planet’s ...