The sign accompanying the lunar module Ascent Propulsion System engine. It
Lunar Module Ascent Engine
This type of rocket engine lifted Apollo astronauts off the moon and into lunar
orbit where they joined the mother ship for the journey back to earth. The
engine requires no ignition; when the fuels meet, they burn on mere contact. A
1/24th scale model of the Lunar Lander which used this engine is in the Lunar
Surface Exhibit at the center of this room.