The United Launch Alliance Atlas V rocket with the NASA's Mars Science Laboratory Curiosity rover rolled out to Space Launch Complex-41 at Cape Canaveral Air Force Station today. The launch team continues working toward liftoff of the Atlas V on Saturday, Nov. 26. Launch day weather remains favorable, with only a 30 percent chance of conditions prohibiting liftoff.

Curiosity is twice as long and five times as heavy as earlier Mars rovers Spirit and Opportunity. The rover will carry a set of 10 science instruments weighing...