Page 47 - Curriculum Visions Dynamic Book

To the Moon—carefully
Nobody wanted to embark into such uncharted territory without many small, careful preparatory steps. Several Apollo missions were completed without touching down on the Moon’s surface. Apollo 7 made a 163-orbit flight carrying a full crew of three astronauts. Then Apollo 8 took a lunar trajectory, completed a lunar orbit, and returned safely to Earth.
Apollo 9 did not go to the Moon but spent time in Earth orbit testing the lunar module. Apollo 10 did go to the Moon but tested the lunar module without landing.
 The complete lunar module, or Eagle.
dock To meet with and attach to another space vehicle.
thrust A very strong and continued pressure.
trajectory The curved path followed by a projectile.
This part of the lunar module housed the rocket used for landing. It was also used as a stable launch pad for lunar liftoff.
Descent engine
This part of the lunar module housed two astronauts
during touchdown and also contained the engine used for liftoff and maneuvering in order to rejoin the command and service modules.
Ascent engine
47