The second of two Mars Exploration Rovers, Opportunity, is rescheduled for launch Monday, July 7 at 10:35:23 p.m. EDT. Liftoff will occur aboard the Boeing Delta II Heavy launch vehicle from Pad B at Space Launch Complex 17 on Cape Canaveral Air Force Station. A second launch opportunity exists at 11:18:15 p.m. EDT, if necessary. Should launch be delayed by 24 hours, two launch times are also available on Tuesday at 10:27:46 p.m. and 11:10:44 p.m. EDT. The window of the planetary launch period extends through July 15.