On the controls in front of him, there was an X and a picture of the luuar module. Ken had to get the X over the picture. That way, the lunar module and the command module could dock. This was important. The lunar module was behind the command module when Apollo 13 left Earth. In space, the astronauts had to move it. They could only go from one module to the other module when the two modules were nose to nose. Fred watched the numbers the controls. Houston. we're at thirty meters now he said into his radio.