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

A new study reanalyzing 14 years of Hubble data weakens evidence for water vapor plumes on Europa, though scientists say the ...

Intro After writing two Io articles I return to Io  again my favourite moon, looking at one single lava flow field. But read Alberts and my two other Io posts first. Jupiter’s moon Io ...

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

Here's when to see a pair of massive letters shining on the lunar surface around May's first quarter moon phase.

The team still can't confidently rule out the existence of Europa's water vapor, especially as similar plumes have been more ...

Neptune has a complicated life story, and its moon Nereid might be the only one left standing from the planet’s ...

Ganymede and Europa transit Jupiter tonight, while Io disappears in an occultation. West Coast observers can catch a double ...

Europa’s faint glow in ultraviolet light once looked like a possible water plume punching through ice. After 14 years of ...

Our solar system appears to be very stable. The orbits of planets, moons, comets, and other objects are predictable enough to ...

On the evening of May 20, skywatchers in the United States will witness a striking celestial display as the waxing crescent ...

On Wednesday, May 20, skywatchers looking west after dusk will be able to spot the crescent Moon glowing beside Jupiter for ...