... Tonight's Sky . ... Observing . ... Follow the water . Mars rovers sharpen questions about living conditions on the Red Planet. ... NASA's current rovers and orbiters at Mars pursue the agency's "follow the water" theme for Mars exploration. ... The following mission, the Mars Science Laboratory rover, will incorporate many lessons from the current rovers, says that project's manager, Richard Cook of JPL. ... Only registered members of Astronomy.com are allowed to comment on this article. ...