Help Shape the Future of Space Exploration

Join The Planetary Society Now  arrow.png

Join our eNewsletter for updates & action alerts

    Please leave this field empty
MER Update

Mars Exploration Rovers Special Update: Opportunity Finds Best Evidence Yet for Liquid Water in Gypsum at Homestake

Posted by A.J.S. Rayl

07-12-2011 10:24 CST

Topics: mission status, Mars Exploration Rovers, Opportunity

Mars Exploration Rovers Mars Exploration Rovers
Credit: NASA / JPL-Caltech / Maas Digital

Mars Exploration Rover Opportunity has discovered gypsum and its "single most powerful piece of evidence for liquid water on Mars," Steve Squyres, the mission's principal science investigator and Cornell University professor, announced today during the American Geophysical Union (AGU)  fall meeting being held in San Francisco.

Opportunity found the gypsum last month in a striking light-toned vein "running" through bedrock. The vein, which the team dubbed Homestake, is small, but the rover easily spotted it in late October as it was as it driving north/northwest along the western edge of Cape York on the rim of Endeavour Crater. By the first week in November it was checking out the vein with its scientific instruments.

"The morphology of this just screams water," Squyres said.

Opportunity found Homestake and other veins like it in an apron or Bench, as the team calls it, that surrounds a segment of the rim of Endeavour Crater, a zone where the sulfate-rich sedimentary bedrock of the plains meets older, volcanic bedrock of the rim.

See other posts from December 2011


Or read more blog entries about: mission status, Mars Exploration Rovers, Opportunity


Leave a Comment:

You must be logged in to submit a comment. Log in now.
Facebook Twitter Email RSS AddThis

Blog Search


Advocate for Space!

Fifteen years ago, Society members and passionate space advocates like you helped save the Pluto mission. Now we can do the same for missions to Europa and Mars.

Join over 27,600 people who have completed their petition and consider a donation to support advocacy efforts.

Sign Our Petition

Featured Images

LightSail-B on the bench
Blue Origin New Shepard after first landing
New Shephard test flight and booster landing
Suni Williams and Doug Hurley in Crew Dragon
More Images

Featured Video

MISSIONS: Dawn In The Asteroid Belt With Marc Rayman

Watch Now

Space in Images

Pretty pictures and
awe-inspiring science.

See More

Selfies to Space!

Take flight with a selfie on LightSail™ in 2016!

Send a Selfie Now

Connect With Us

Facebook! Twitter! Google+ and more…
Continue the conversation with our online community!