For the study, Dr. Hirata used a series of mathematical calculations to ascertain the size of the object that impacted Ganymede billions of years ago along with the angle of impact that produced the ...

At nearly 3,300 miles in diameter, Ganymede is also the solar system’s largest moon—bigger even than the 3,030-mile wide planet Mercury. But that doesn’t mean it’s impervious to a pounding.

An asteroid 20 times larger than the one that may have wiped out the dinosaurs struck Jupiter's moon Ganymede some 4 billion years ago, dramatically shifting the possibly life-hosting satellite's ...

Ganymede is the largest moon in the solar system, and it’s slightly bigger than the planet Mercury. Even so, the monstrous asteroid that slammed into it would have rejiggered that world inside ...

Even more curious, the site is immediately south of what is called the tidal axis. Like our Moon, Ganymede is locked by the tidal forces of Jupiter so one side always faces the planet. The impact ...

The dynamic motion of Ganymede’s aurorae can be seen in this sequence of images taken by the Keck I telescope on Maunakea. Credit: Milby et al., The Planetary Science Journal, 2024, CC BY 4.0 ...

Differences in the number and speed of cometary impacts onto Jupiter’s large moons Ganymede and Callisto some 3.8 billion years ago can explain their vastly different surfaces and interior ...