LEM

He couldn’t stop smiling, not even when he was describing the thermodynamics of the fuel for the Saturn rocket that would carry the command capsule and the LEM.

These zip together, causing a friend to amusingly refer to them as the Command Module and the LEM.

Cernan and Schmitt ventured up to five miles from the safety of their LEM, aided in no small part by the lunar rover — effectively a collapsible moon car — that they’d brought along.

Armstrong’s and Aldrin’s entire time outside the LEM was 2 hrs. and 31 mins. — and in all that time they never wandered very far from the safety of their little ship.

"You know, this little device has more computing capacity—by a large order of magnitude—than we had to work with in the entire LEM."