> There's strong speculation that there was an ocean on Mars, many years ago. Yep. Here's a great book on the topic: http://www.amazon.com/Travelers-Guide-Mar

> There's strong speculation that there was an ocean on Mars, many years ago. Yep. Here's a great book on the topic: http://www.amazon.com/Travelers-Guide-Mars-William-Hartmann/dp/0761126066/ http://www.amazon.com/Travelers-Guide-Mars-William-Hartmann/...