Remember When: Armstrong, Aldrin walked on the moon
Today marks the 40th anniversary of the Apollo 11 mission in which astronauts Neil Armstrong and Buzz Aldrin walked on the moon while astronaut Michael Collins stayed in the moon's orbit.
We're marking the anniversary with NASA photos taken from our archives and some links to NASA's information on the moon and Apollo 11 mission.
"In 1961, U.S. President John F. Kennedy had a challenge for NASA," NASA's Web site said on the 39th anniversary of the mission. "The challenge was to land a man on the moon before the end of the decade (before 1970). The race to meet his goal would require the greatest technological achievement the world has ever seen.
"The first Apollo missions were spent getting ready for the moon landing. Apollo 8 and Apollo 10 even flew all the way to the moon, around it, and back to Earth. Finally, everything was ready. On July 16, 1969, Apollo 11 launched from Kennedy Space Center in Florida. They traveled to the moon and arrived in lunar orbit on July 19."