The vernal equinox occurs as Mercury stands still in Pisces and several of Jupiter’s moons transit in the sky this week.

Earlier this week, Saturn gained a whopping 128 new official moons, as the International Astronomical Union recognised ...

The smashups are thought to have occurred at least 100 million years ago, but the moons they created are new to astronomers.

Four billion years ago, Ganymede literally got knocked sideways. A giant asteroid slammed into Jupiter’s largest moon, ...

A new study by Kobe University planetologist Hirata Naoyuki has revealed that Ganymede, the largest moon in our solar system, experienced a massive asteroid impact approximately 4 billion years ago.

The number of known moons in our Solar System has been rising for centuries, but astronomers say it has probably peaked – for ...

A stunning Blood Moon March 13/14 caps off plenty of planetary action and sparkling stars in the sky this week.

Jupiter's largest moon Ganymede is generating "killer" waves of electrons that astronomers say could damage spacecraft going on future missions. These electromagnetic waves can be found all around ...

NASA announced that it has evidence that Jupiter’s moon Ganymede, the largest moon in our solar system, has a vast ocean lurking underneath its icy crust. WSJ's Monika Auger reports. Photo ...

Ganymede, and Callisto. The Moon is non-luminous, meaning that it does not produce light. We see the Moon because it reflects light from the Sun, and half of the Moon’s surface is always ...