S69-34313 (20 May 1969) --- Astronaut Eugene A. Cernan is shown spinning a water bag to demonstrate the collection of hydrogen bubbles in this color reproduction taken from the fifth telecast made by the color television camera aboard the Apollo 10 spacecraft. When this picture was made the Apollo 10 spacecraft was approximately 175,300 nautical miles from Earth, and only 43,650 nautical miles from the moon. Cernan is the Apollo 10 lunar module pilot. Also, aboard Apollo 10 were astronauts Thomas P. Stafford, commander; and John W. Young, command module pilot.