Neptune's two innermost moons are locked in an unusual "dance of avoidance," according to researchers.
Neptune, the other blue planet, is the eighth planet in our solar system. Neptune is an ice giant.
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.
Planet Nine will probably be detected within a decade or so, if the putative world does indeed exist, a new study suggests.
If you don't like your local weather, perhaps you would prefer the atmosphere on Uranus or Neptune — and the Hubble Space Telescope has an update on each planet's current conditions.
The weirdly clustered orbits of some far-flung bodies in our solar system can be explained without invoking a big, undiscovered "Planet Nine," a new study suggests.
NASA's Transiting Exoplanet Survey Satellite (TESS) has discovered a 'sub-Neptune' planet orbiting the star HD 21749, which lies about 53 light-years from Earth.
As NASA's New Horizons probe nears its second target, we investigate what's lurking at the edge of the solar system.
A gaseous alien world is evaporating at a record rate, shedding considerable light on an exoplanet mystery, a new study reports.
Evidence of a big, unseen world in the extreme outer solar system continues to mount, giving astronomers more and more confidence that "Planet Nine" is real.
Why settle for a planet or two when you can catch all of them in just one night of intense skywatching?
"Twinkle, twinkle, little star" is a twisted sort of lullaby for astronomers, because the effect that enchants the casual stargazer blurs images taken by even the most powerful telescopes.
Jupiter's Great Red Spot — the most powerful storm in the solar system — is an planetary icon. See photos of the giant storm, which has been shrinking over time, in our full gallery here.