Planets

Ice Giants: Neptune and Uranus

Spot Uranus and Neptune, and relive the original discoveries.

Explore the Night with Bob King

Observe Neptune as it Comes to Opposition

Neptune, currently the Solar System's outermost planet, reached opposition on September 10th at magnitude 7.8 in Aquarius.

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.

Illustration of Jupiter Trojans

Solar System

Trojan Asteroids Are in a Class of Their Own

Hordes of debris trapped by Jupiter and Neptune have distinct colors that mark them as possibly the last remnants of the material that built the giant planets.

Explore the Night with Bob King

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.

Solar System

Hubble: Weather Watcher of the Outer Solar System

Hubble's powerful eye scouts the outer planets once an Earth year, shedding light on planetary weather, like Jupiter's Great Red Spot and Neptune's Great Dark Spot.

Explore the Night with Bob King

Dawn Dances, Neptunian Nights, and Eclipse Essence

The planets are aligning! The week ahead will feature multiple planetary conjunctions at dawn and great views of Neptune and Triton at nightfall.

New Year's Revelers Passing in the Night

Explore the Night with Bob King

Mars Meets Neptune on New Year's Eve

Doing anything on New Year's Eve? Before you start toasting, don't miss an exceptionally close conjunction of Mars and Neptune.

Visibility zones for Two Occultations

Celestial News & Events

See Two Tricky Occultations — Neptune and Lambda (λ) Aqr

Now you see 'em, now you don't. Watch the Moon occult Neptune and nearby Lambda Aquarii on the same night.

Worlds of gas and ice

Explore the Night with Bob King

Neptune And Its Maverick Moon Triton

Neptune reaches opposition next week, giving amateurs the chance to track its unique, backwards-orbiting moon Triton.

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