On March 2, 1979, a paper in Science ruminated on Io’s strange orbit. Because of the positions and orbits of neighboring moons, Io’s orbit is elliptical rather than circular.

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.

Tiny glass beads formed in the fires of explosive volcanic eruptions on the moon, and brought back to Earth by Apollo 17, ...

No one expected these glittering bits among the gray lunar dust back then. The beads, smaller than grains of sand, formed ...

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 ...

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 ...