John Young is the only astronaut to have flown during the Gemini, Apollo and space shuttle programs. He was the…
L is for Launch.
M is for Mission.
N is for Navigation.
O is for Optical Communications.
P is for Passive Sensor.
Q is for Quantum Entanglement.
R is for Return Link.
S is for Solar System.
T is for Tracking and Data Relay Satellite (TDRS).