NASA's Juno spacecraft has snuck a peek at one of Jupiter's largest inner moons. During a close flyby, the spacecraft got a look at Jupiter's moon Thebe from just 3,100 miles (5,000 kilometers) away.

The largest moon in the solar system — Jupiter’s Ganymede — has a unique and inexplicable magnetic field. New research could finally explain it: the moon is heating up.

A new study suggests Ganymede—our neighborhood's biggest moon—still has a hot, churning core cranking out its unique magnetic ...

Jupiter and Saturn, these two giant and gaseous planets, are similar in size but present a striking contrast: their moon families are very different. While Jupiter is surrounded by a multitude of ...

Mars’ frozen ice caps may be time capsules for ancient life. Lab experiments show that key building blocks of proteins can survive tens of millions of years in pure ice, even under relentless cosmic ...

Ganymede is the largest moon in the Solar System at 5,268 kilometers, and is bigger than Mercury. New research suggests that ...

Jupiter’s moon Ganymede is already famous for being the largest moon in the solar system. At more than 3,200 miles wide, it ...

The moon glows with the Beehive Cluster on May 21, as a trio of planets form up in the evening sky.

Venus, now an "evening star," remains the brightest object in the sky after the moon, while Jupiter shines higher above it ...

NASA's Juno spacecraft captured this view of Thebe, the second largest of Jupiter's inner moons, during a close pass on May 1, 2026. The spacecraft's Stellar Reference Unit (SRU) captured this image ...

Looking for a sky event this week? Check out our full Sky This Week column. May 21: Check in on Saturn and Mars Tonight we're ...

Using data from the Webb space telescope, a team of researchers is suggesting that Neptune’s moon Nereid is the only survivor ...