Professor Dave Explains on MSN

NASA sent 2 astronauts into a spacecraft that couldn’t bring them home - docking again was their lifeline

Apollo 9 tested the spacecraft that would carry astronauts to the Moon. Two crew members flew it independently in Earth orbit, where returning safely depended on rendezvousing and docking with the ...
Public Broadcasting Service (PBS)

The Apollo Missions

Early Apollo Missions: Earth Orbit Apollo missions flew unmanned until October 11, 1968, when Wally Schirra, Donn Eisele and ...