Having trouble viewing this email? | View it in your browser   Researchers cannot yet say whether what they found stems from life or a more mundane process. The material was discovered by the Mars Curiosity Rover, which has been collecting data on the Red Planet since August 2012. FOR MORE ON THIS STORY, GO TO:   USATODAY.COM       You are currently subscribed to this newsletter with the address: newsletter@newslettercollector.com. To UNSUBSCRIBE please click here.     Manage Subscriptions | Help | Advertise | Home Delivery | Privacy Policy - Your California Privacy Rights     © 2017 USA TODAY, a division of Gannett Satellite Information Network, LLC. 7950 Jones Branch Drive, McLean, VA 22108