In this historical photo from the U.S. space agency, the two members of the Apollo 13 crew who will land on the Moon's Fra Mauro region in the lunar module this spring underwent a walk-through of the extravehicular activity timeline on Jan. 28, 1970.
Fred W. Haise, Jr., Lunar Module Pilot, tries out a motorized core sampler, right, while James A. Lovell, Jr., the Apollo 13 Commander, looks on at left.
Each weekday, SPACE.com looks back at the history of spaceflight through photos (archive).