In an interactive video experience at "Welcome to Mars," the latest educational resource from the Public Broadcasting Service (PBS), Steve Squyres, principal scientific investigator of the Mars rover mission, narrates a "once-in-a-lifetime" visual tour of the rovers' most revealing discoveries. Using compelling photography from the Spirit and Opportunity rovers, Squyres describes NASA's search for the presence of water in the planet's bedrock, fighting technical issues and potential disappointment along the way. With each breathtaking image, Squyres relives the excitement of finding proof that water once existed on Mars--and of discovering what kind of environment the planet once had. This visual...

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