Home Contact | About | Friends of McDonald | Sign up for Sky Tips
McDonald Observatory McDonald Observatory
A production of the University of Texas McDonald Observatory
StargazingResourcesRadioMagazineTeachersGift ShopMedia Center
Image Gallery > Image of the Week: September 9, 2007

Send to a friend 
Enlarge image
Keywords
Saturn's Moons 
Cassini to Saturn 
Resources
FAQs about The Solar System
Solar System Guide
Astronomy Gift Shop
2009 Sky Almanac
Pentax 10x50 binoculars
McDonald Observatory logo cap

The one constant in the Universe: StarDate magazine
Walnut Moon 
Walnut Moon 
Iapetus, a moon of Saturn, looks like a walnut in this image from the Cassini spacecraft. A tall, sharp mountain ridge traces the moon's equator, providing the walnut appearance. One side of ice is as white as snow (at the top of the picture), while the other is almost as dark as charcoal. Cassini will fly close to Iapetus on September 10. [NASA/JPL/SSI] For more information, see our September 9 program.

Show all images about:

Copyright ©1995-2006 The University of Texas McDonald Observatory. Material on this site may be linked to, quoted or reproduced for educational or personal purposes without prior permission, provided appropriate credit is given. Teachers, scout leaders, and others may distribute the material for classroom instruction or related educational purposes. The materials may not be sold or published in any other form without written permission from The University of Texas McDonald Observatory.