Preparations for the January Mars landings by NASA’s two mobile robotic geologists, Spirit and Opportunity, will be discussed at a press briefing 1:00 p.m. EST, Dec. 2, 2003. The briefing is in the NASA Headquarters Webb Auditorium, 300 E Street SW, Washington. NASA TV will broadcast the briefing live with two-way media question-and-answer capability from participating agency centers. Panelists will discuss preparations to accomplish the challenging Mars landings.