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