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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.
Jupiter's Moon Amalthea
Explanation: Amalthea is Jupiter 's fifth largest moon, much smaller than the four Galilean satellites Io , Europa , Ganymede , and Callisto . The orbit of Amalthea is inside of these moons, and with its long axis always pointing toward Jupiter . It's dark surface color is probably due to sulfur being expelled from Io . Amalthea is not massive enough for its internal gravity to make it spherical. Amalthea was discovered in 1892 by Edward Barnard.
| Date | November 3, 1995 |
|---|---|
| Credit | Credit: NASA, Voyager 1, Copyright Calvin J. Hamilton |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |