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On Launch Complex 17-A, Cape Canaveral Air Force Station, the Boeing Delta II rocket and Mars Exploration Rover 2 (MER-A) are ready for the third launch attempt after weather concerns postponed earlier attempts. MER-A is the first of two rovers being launched to Mars. When the two rovers arrive at Mars in 2004, they will bounce to airbag-cushioned landings at sites offering a balance of favorable conditions for safe landings and interesting science. The rovers see sharper images, can explore farther and examine rocks better than anything that has ever landed on Mars. The designated site for MER-A mission is Gusev Crater, which appears to have been a crater lake. The second rover, MER-B, is scheduled to launch June 25.