![Request for Information – Potential [Placeholder for Prize]](https://assets.science.nasa.gov/dynamicimage/assets/science/psd/solar/2023/09/s/solarsystem_0.jpg?w=1024)
APOD
Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
Callisto: Dark Smashed Iceball
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.
| Date | September 6, 1995 |
|---|---|
| Credit | Credit: NASA, Voyager |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |