Changes on the Surface of Io

This Hubble Space Telescope pair of images of Jupiter's volcanic moon Io shows the surprising emergence of a 200-mile diameter large yellowish-white feature near the center of the moon's disk (photo on the right). This is a more dramatic change in 16 months than any seen over the previous 15 years, say researchers.

For comparison the photo on the left was taken in March 1994 -- before the spot emerged -- and shows that Io's surface had undergone only subtle changes since it was last seen close-up by the Voyager 2 probe in 1979.


J. Spencer (Lowell Observatory), and NASA/ESA

About the Image

NASA press release
NASA caption
Release date:10 October 1995, 05:00
Size:800 x 600 px

About the Object

Type:Solar System : Planet : Satellite
Solar System : Planet : Satellite : Feature : Surface
Category:Solar System

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Large JPEG
61.1 KB
Screensize JPEG
93.2 KB

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Ultraviolet Hubble Space Telescope

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