20°C
Porth, Newquay, Cornwall. UK
Updated27/07/2026 11:30 
 




NASA Astronomy Picture of the Day

🌌 NASA Astronomy Picture of the Day

Callisto: Dark Smashed Iceball

Date: 1995-09-06

Callisto: Dark Smashed Iceball

View HD Image

Explanation:

Callisto is a dirty battered world, showing the most beaten surface of Jupiter's major moons. Made of a rocky core covered by fractured ice, Callisto's past collisions with large meteors are evident as large craters surrounded by concentric rings. The four largest moons of Jupiter: Io, Europa, Ganymede, and Callisto were all discovered by Galileo and Marius in 1610 with early telescopes and are now known as the Galilean satellites. The NASA spacecraft Galileo is scheduled to arrive at Jupiter is December of 1995.