Apollo 11 astronauts

Apollo 11 astronauts Neil Armstrong, Michael Collins and Edwin Aldrin are seen during a walk-through egress test in this June 10, 1969 handout photo courtesy of NASA.[Photo/Agencies]

Apollo 11 astronauts Neil Armstrong (L) and Buzz Aldrin prepare for an EVA training session, watched by Deke Slayton (R) in this undated handout photo courtesy of NASA. [Photo/Agencies]