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Lost Jovian moon J 23

Solar System

Amateur Astronomer Finds “Lost” Moons of Jupiter

An amateur astronomer has recovered four of five "lost" Jovian moons.

Solar System

Jupiter and Saturn Embrace in Solstice Conjunction

Jupiter and Saturn fashion the Great Conjunction of 2020 when they pair up on December 21st, the winter solstice. That evening they'll be closest in nearly 400 years.

Jupiter and Saturn in conjunction

Conjunction

Jupiter and Saturn Have Historic Dusk Encounter

Don't miss the upcoming close conjunction of Jupiter and Saturn on December 21st!

Jovian sprite

Solar System

Juno Discovers Sprites and Elves on Jupiter

NASA's Juno spacecraft has captured ultraviolet images of a rare atmospheric phenomenon in Jupiter's atmosphere.

NTB via Juno

Explore the Night with Bob King

Stormy Times on Jupiter, Comet Howell Steps Up, and More

Colder weather might be coming, but don't pack away that telescope! You'll miss a powerful storm that's remaking Jupiter's North Temperate Belt, a returning comet, Mira on the rise, and a bright supernova in the Great Bear.

Jupiter, Ganymede, Europa and double shadows, March 25, 2019

Solar System

Study Suggests Jupiter Could Have 600 Moons

New detections of candidate moons suggest that the king of planets could have hundreds of smaller satellites.

Venus-Jupiter conjunction

Planets

How Bright Are the Planets?

What do Venus and Jupiter have in common? Revisions to planets' magnitudes in this year's Astronomical Almanac have revealed some surprises.

Moment of impact

Explore the Night with Bob King

Texas Amateur Detects Possible Impact on Jupiter

It looks like Jupiter got slammed again! A bright flash from a possible impact lit up the planet's South Equatorial Belt Tuesday night. 

Flakey Red Spot

Planets

Jupiter Is Outstanding at Opposition

Prime-time Jupiter viewing kicks off this month when the planet reaches opposition on June 10th. 

Celestial News & Events

Astronomers Identify Weather Cycle on Jupiter

Astronomers have identified a periodic clearing at the gas giant's equator; amateurs may have spotted the change at the end of 2018.

Solar System

Future Planetary Probes Can Learn from Cassini

An unusual water composition at Saturn’s moon Phoebe means that future spacecraft will have to be on the lookout for different water ratios than we are used to on Earth.

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.

Jupiter, color-enhanced

Solar System

Jupiter’s Magnetic Field Has Weird Structure

Juno observations reveal that Jupiter’s magnetic field has a wacky plume.

Celestial News & Events

Jupiter Shines with a Mighty Light

Jupiter's at opposition this week. Close and bright, it shines like a midnight version of Venus. No matter your scope, the biggest planet is always a crowd-pleaser.

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.

Jupiter's South Pole

Spacecraft and Space Missions

Amazing Storms, Jet Streams on Jupiter

NASA’s Juno spacecraft has found breathtaking cyclones at Jupiter’s poles and probed how deep the planet’s jet streams go.

Explore the Night with Bob King

Mars Flies By Jupiter in a Close Dawn Conjunction

The new year opens with the magnificent pairing of the solar system's largest planet with one of its smallest.

Jupiter's Great Red Spot

Solar System

Juno Probes Depths of the Great Red Spot

NASA’s Juno spacecraft peeked under the clouds of the most iconic weather feature in the solar system, Jupiter’s Great Red Spot, revealing a complex structure deep below the surface.

Celestial News & Events

An Exquisite Venus–Jupiter Conjunction

Venus bids farewell at dawn, but not before a close encounter with returning Jupiter.

5th Jupiter flash on record

Celestial News & Events

New Impact Flash Seen on Jupiter

Flash! A comet or asteroid fragment whacked Jupiter on May 26th. It's the sixth time that observers on Earth have witnessed an impact on the giant planet.

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