The traffic on Mars is expected to double in the near future. NASA today announced plans to launch two large scientific rovers to the red planet in 2003, rather than the original plan for just one, said Dr. Ed Weiler, Associate Administrator for Space Science, NASA Headquarters, Washington, DC. Both Mars rovers currently are planned for launch on Delta II rockets from Cape Canaveral Air Force Station, FL. The first mission is targeted for May 22, with the second launch slated for June 4. After a seven-and-a-half month cruise, the first rover should enter Mars’ atmosphere January 2, 2004, with the second rover bouncing to a stop on the Martian surface January 20.