A long-range rover designed to sniff for water will be launched to Mars in 2003 in a mission similar to the wildly successful Mars Pathfinder mission, NASA announced Thursday. The mission is expected to cost $350 million – $400 million. NASA’s Jet Propulsion Laboratory will build the rover. Officials also are looking into the possibility of sending a second rover to a different location on the Red Planet — an unprecedented feat that, if successful, could shore up the agency’s bruised image at Mars.