NASA aims to launch next week the second of two rovers it’s sending to the surface of Mars on separate missions to prospect for evidence the Red Planet was once a warmer, wetter place hospitable to life. The six-wheeled robot, named Opportunity, is set for launch early Thursday Eastern Daylight Time from Cape Canaveral, Fla. Its launch was delayed a day by setbacks to the earlier liftoff of the first rover, Spirit. NASA launched Spirit on June 10.