The way each planet's atmosphere responds to methane might be responsible for the different hues of Uranus and Neptune.

To understand this overlooked composition means going back to Uranus and Neptune’s formation billions of years ago. To contain so much water, the planets must “accrete,” or gather under its ...

Scientists have recently discovered something strange about this planet and it’s changing what we know about how planets are formed.

In 2005 an object larger than Pluto was discovered in the Kuiper Belt. This discovery would call Pluto's planetary status into question and help create a new term, Dwarf Planet.

[The Moons of Neptune Unmasked! (Infographic)] The seven inner moons of Neptune are shown at a consistent set of sizes, along with the planet’s bluish limb at right.

Our solar system may have a ninth planet about 10 times the mass of Earth far out beyond Neptune, only the third discovered in our solar system since ancient times, astronomers say.

After Voyager 2 flew by Neptune in 1989, new calculations determined there was no Planet X. But three years ago, a disturbance was detected at the far reaches of the Solar System.

Long-lost documents relating to the 19th Century discovery of the planet Neptune are shedding new light on one of the most controversial episodes in the history of astronomy. British Neptune ...

Observations of the Neptune-like exoplanet HAT-P-26b show that its atmosphere is less rich in heavy elements than expected, meaning it probably formed close to its star.

Massive Earth-sized spot which has just appeared on Neptune 'is alien nuclear strike' A MIND-BLOWINGLY huge white spot raging across the planet Neptune has baffled the experts and led to claims of ...