Discovery Channel :: Mission to Mars: Images From the Rovers

Slide Show

1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 . 10 . 11

Pictures: NASA/JPL/U.S. Geological Survey |

Vug Spherules

March 2, 2004 — This image, taken by the Microscopic Imager, shows a spherule, or sphere-shaped grain, penetrating the interior of a small cavity called a vug, at lower left. This "cross-cutting" relationship allows the relative timing of separate events to be established. In this case, the spherule appears to "invade" the vug, and therefore likely post-dates the vug, suggesting that the spherules may have been one of the last features to form within the outcrop.

1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 . 10 . 11

Pictures: NASA/JPL/U.S. Geological Survey |

SUBSCRIBE TO OUR NEWSLETTERS

HowStuffWorks | TreeHugger | Petfinder | PetVideo | Discovery Education

Visit the Discovery Store: Toys & Games | Telescopes | DVD Sets | Planet Earth DVD | Gift Ideas

By visiting this site, you agree to the terms and conditions
of our Visitor Agreement. Please read. Privacy Policy.
ATTENTION! We recently updated our privacy policy. The changes are effective as of September 10, 2008.
To see the new policy, click here. Questions? See the policy for the contact information.

Copyright © 2012 Discovery Communications, LLC.

The leading global real-world media and entertainment company.