Neptune is the keeper of the deep: The last known major planet from the Sun, the god of the boundless sea beyond the inner solar system that marks the shore of the black depths of interstellar space.

Uranus and Neptune have been called the “ice giants” for decades. But in new research, that nickname might be more a misnomer ...

We actually know very little about what's going on inside Uranus and Neptune, causing researchers to propose that these ...

NASA is planning a mission to the coldest known object in our solar system in its hunt for alien life. The legendary space agency wants to send a high tech probe to Neptune's icy moon Triton, which ...

(CNN) -- New images released Wednesday from NASA's James Webb Space Telescope are revealing Neptune, and the planet's hard-to-detect rings, in a fresh light. "It has been three decades since we last ...

Say hello to Hippocamp, a celestial pipsqueak that's making big waves at the edge of our solar system. With help from NASA's Hubble Space Telescope, astronomers have confirmed the existence of this ...

CAPE CANAVERAL, Fla. (AP) — Neptune and its rings haven’t looked this good in decades. NASA released new glamour shots of our solar system’s outermost planet Wednesday taken by the James Webb Space ...

You probably already know that gravity can greatly influence cosmic objects as they make their way through space. We see this constantly in how the Sun's gravity causes planets to orbit it. And even ...

When Voyager II flew past Neptune in August of 1989 it revealed a complex system of 13 moons, six of which had never been seen before. Thirty years later, scientists say the space probe missed one.

Scientists have observed that some of Neptune's Trojan asteroids are deep red, possibly revealing what asteroids may have been like in the early days of the solar system. Neptune is famously a vivid ...