Apollo 10 was a May 1969 human spaceflight, the fourth crewed mission in the United States Apollo program, and the second to orbit the Moon. It was the F mission: a "dress rehearsal" for the first Moon landing, testing all the components and procedures just short of actually landing.
Launch date: May 18, 1969
Mission duration: 8 days, 3 minutes, 23 seconds
Astronauts: Thomas P. Stafford, John Young, Gene Cernan