A Neptune-like planet has never been found so close to its host star. And in fact, astronomers came up with a term, the “Neptune desert,” to describe this up-close-and-personal stellar zone.

Frigid and far-flung Neptune, our solar system's outermost planet, is adding to its reputation as an enigmatic world, with astronomers puzzled by a surprising drop in its atmospheric temperatures ...

In October 2017, NASA released a statement saying that Planet Nine may be 20 times further from the Sun than Neptune is, going so far as to say "it is now harder to imagine our solar system ...

Since then, the planet has only been visited once by spacecraft when, in 1989, Voyager 2 completed its 'Grand Tour' of our solar system's outermost planets. It took this image of Neptune and its moon ...

In a groundbreaking study, astronomers describe the strange atmosphere of a Neptune-like exoplanet more than 400 light years away. The discovery could yield vital clues about our own solar system.

Astronomers say they’ve discovered clear skies and water vapor on a Neptune-sized exoplanet named HAT-P-11b -- which, at roughly four times the Earth’s radius, is the smallest planet yet known ...