Recent flybys of the fiery world refute a leading theory of its inner structure—and reveal how little is understood about ...

ESA's Mars Express orbiter captured footage of the Mars' moon Deimos pass in front of Ganymede, Europa, Jupiter, Io and ...

kilometers (124 miles) of Io in February, and transmitted them to Earth during the following eight months. To approach Io, the spacecraft had to enter a region of hazardous radiation around Jupiter.

Thermal images of Io's volcanoes Pele and Pillan taken by the Keck and Gemini telescopes reveal no detectable heat from Pillan Patera during multiple observations between December 2021 and June 2023.

At last count, Jupiter has 95 moons, but the four main ones — Ganymede, Callisto, Io and Europa — were discovered in 1610 by famed Italian astronomer Galileo Galilei.

Amazingly, the samples of material from the moon retrieved by the Apollo missions are still providing new insights more than 50 years later, in this case how tiny glass beads that litter the lunar ...

Scientists have probed tiny glass beads among NASA's Apollo 17 rock samples and found new information about the moon's ancient volcanoes.

The moon was once a hive of volcanic activity. But while the vents have remained inactive and dormant for tens of millions of years or more, the satellite retains evidence of its once volatile past – ...

NASA has discovered the third known interstellar object to pass through our solar system, but the icy snowball object poses ...