A six-year search of space beyond the orbit of Neptune has netted 461 newly discovered objects, including four that could shed light on Planet Nine.
Neptune, the other blue planet, is the eighth planet in our solar system. Neptune is an ice giant.
The solar system's outermost planet, Neptune, reaches opposition today, and here's how you can catch a glimpse of the distant gas giant.
Some of the most fascinating worlds in our cosmic neighborhood are not planets, but the moons that orbit around them.
What if one mission could study the gravitational ripples triggered by some of the most violent events in the universe — on the way to observing the least-known planets of our solar system?
A dark storm on Neptune abruptly switched directions and started moving away from almost certain death, puzzling astronomers.
If you had a few billion dollars and some of the most talented space scientists and engineers in the world, where would you go?
Just how many planets are visible without a telescope? Most people will answer "five," but there is a sixth planet that can be glimpsed without visual aid: the planet Uranus.
The Corn Moon will be full on the afternoon of Wednesday, Sept. 2, at 1:22 p.m. EDT (1722 GMT), four days before the moon occults Mars.
Researchers are investigating an alien version of water inside the strange, icy interiors of Uranus and Neptune.
The list of Pluto's neighbors just got considerably longer, potentially boosting scientists' odds of finding the putative Planet Nine.
Neptune's two innermost moons are locked in an unusual "dance of avoidance," according to researchers.
This week is a great time to see the solar system's outermost gas giant planet, if you have a telescope and a little patience.
Neptune's largest moon Triton boasts a unique icy mixture of carbon monoxide and nitrogen, which could help astronomers better understand the conditions of other distant, alien worlds.
It's been decades since a spacecraft visited either Uranus or Neptune — which means scientists are busy dreaming up instruments that could be flown out on the next probe to these ice giants.
Neptune's moon Triton is one of the strangest worlds in the solar system — and that's why scientists are exploring mission concepts that could give them a detailed look at it.
For the first time ever, astronomers have witnessed the birth of one of Neptune's enormous 'Great Dark Spot' storms.