Solar System

Four of Uranus's Moons Might Contain Briny Oceans

Four of Uranus's five icy moons likely contain a thin layer of briny (or otherwise enriched) water, astronomers have concluded from Voyager 2 data.

The planet Uranus on a black background. The planet appears light blue with a large, white patch on the right side. The image is labelled to indicate the locations of the planet’s clouds, polar cap, and zeta ring

Solar System

James Webb Space Telescope Captures Another Ringed Planet

Webb has returned an image of ringed Uranus, currently experiencing the dog days of northern hemisphere summer.

Cool blue world

Solar System

Do Diamonds Rain on the Ice Giants?

New research shows diamonds might condense out of Neptune's mantle, but not Uranus', explaining a decades-old discrepancy.

Uranus and Neptune

Solar System

Where Did the Ice Giants Form?

Conventional planet formation scenarios have Neptune and Uranus forming closer to the Sun. But a new study shows that the ice giant planets could have formed right where they are now.

Earth and Uranus compared

Explore the Night with Bob King

Uranus Queues Up for Opposition

Journey to a remote planet then double back to check in on the latest stirrings of Comet 29P/Schwassmann-Wachmann before touching the finger of dawn.

Jupiter, color-enhanced

Solar System

Hail-like “Mushballs” May Fall on All Our Giant Planets

"Mushballs," first inferred to exist on Jupiter, may fall within the atmospheres of all the solar system's giant planets.

Cool blue world

Explore the Night with Bob King

Tiny Asteroid Flora and Mighty Uranus Team Up

Both Uranus and the asteroid 8 Flora came to opposition on Halloween. Catch them both in the same corner of the sky the next clear night.

Planets

Ice Giants: Neptune and Uranus

Spot Uranus and Neptune, and relive the original discoveries.

Ariel transits Uranus

Solar System

Uranian Moons Are Like Dwarf Planets

The moons of Uranus exhibit heat signatures similar to dwarf planets in the Kuiper Belt — where the moons were likely born.

Neptune and Uranus in late 2018

Solar System

Hubble Sets Its Sights on the Ice Giants

New Hubble Space Telescope images reveal an expanded polar cap on Uranus and another mysterious dark vortex on Neptune.

Celestial News & Events

The Outer Planets Move In, plus an "Old Moon" Observing Challenge

As the bright planets march westward, Uranus and Neptune become the fresh new faces of fall. And if you've never seen an ultra-thin lunar crescent, here's your chance.

Venus over Lake Superior

Explore the Night with Bob King

Watch Venus and Uranus Double Up Beneath a Comet

Following an occultation of Rho Leonis by the Moon, watch Venus and Uranus pair up in a weekend conjunction just 10° from Comet ER61 PanSTARRS.

Brothers in Blue

Explore the Night with Bob King

Uranus: In Seventh Heaven with Planet Seven

With our eyes often glued to the bright classical planets, Uranus is easy to overlook. Now well-placed for viewing at a convenient hour, why not pay this pale blue dot a visit the next clear night?