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.
Io's Active Volcanoes
Explanation: Explanation : Why is Io green at night? In this just-released nighttime picture of Jupiter 's moon Io , the red spots clearly show Io 's current volcanically active regions . But what is causing the global green sheen? This telling picture was taken by the automated Galileo spacecraft currently orbiting Jupiter while Io was in Jupiter's shadow. One hypothesis is that the green glow is caused by a different type of aurora resulting from high-energy particles interacting with Io's volcanic plumes .
| Date | October 27, 1996 |
|---|---|
| Credit |
Io's Active Volcanoes Credit: Galileo Mission, JPL, NASA |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |