Neptune, the other blue planet, is the eighth planet in our solar system. Neptune is an ice giant.
A nearly Earth-size storm system was spotted near Neptune's equator, surprising scientists because no bright clouds have ever been seen in that location.
A new Neptune study shows that you don't need to be a professional to do science; amateurs make contributions, too.
New NASA mission ideas would investigate the gassy environments of Uranus and Neptune, two planets on the edge of the solar system that spacecraft have visited only once.
Planets and other celestial bodies can take many types of paths through space. Learn all about the different kinds of orbits in the sixth episode of "We Don't Planet."
The Kepler space telescope, NASA's dedicated exoplanet hunter, has provided a new look at a world close to home: the gas giant Neptune.
The rings of Saturn, Neptune and Uranus are composed of pieces of Pluto-like dwarf planets that strayed too close to the giant worlds long ago, a new study suggests.
Scientists have found moons of Neptune as late as 2013, a quarter-century after Voyager 2 was the first and last spacecraft to swing through the system.
A distant, Neptune-size planet 500 light-years from Earth appears to be the youngest fully formed exoplanet ever found crossing its star, raising questions about how it formed so close, so quickly.
Some astronomers are now scanning the sky in an attempt to find the newly proposed Planet Nine, while others are tackling another mystery: How did it come to be?
A new study models what Planet Nine might look like and how detectable it may be — if the hypothesized world does indeed exist.
In 1989, Voyager 2 approached Neptune and captured the first images of the soft, elongated cirrus-type clouds in the planet's atmosphere.