NASA has changed the launch date of its next space shuttle mission to the international space station to August 7, two days earlier than the previous target, agency officials said on Thursday. The new date will give NASA a bit more time to get shuttle Endeavour off the launch pad during what is shaping up to be a busy time for rocket launches at the Eastern Test Range, which includes the Kennedy Space Center and Cape Canaveral Air Force Station. NASA plans to launch its next Mars probe on August 3 and an Atlas launch to put a new military communications satellite into orbit is planned for August 11, Reuters reported.