Galileo finds spires on Callisto | Science News



Support credible science journalism.

Subscribe to Science News today.


Galileo finds spires on Callisto

5:28pm, September 11, 2001

The sharpest images ever taken of Jupiter's icy moon Callisto show features never seen before on the remote body–icy, knoblike spires that show slow but steady signs of erosion. That's a puzzle because other evidence indicates that Callisto, the most distant of Jupiter's four largest moons, has been inactive for billions of years.

The Galileo spacecraft recorded the spires, which are 80 to 100 meters high, when it passed just 138 kilometers above the moon last May. The images, unveiled Aug. 22, provide the highest-resolution view of any of Jupiter's moons, showing features as small as 3 m across.

This article is available only to subscribing members. Join the Society today or Log in.

Get Science News headlines by e-mail.

More from Science News

From the Nature Index Paid Content