Which of the following is NOT true according to the passage?
A. A satellite needs to be going fast — at least 8 km (5 miles) a second.
B. Satellites that travel closer to Earth contend with drag of more atmospheric molecules.
C. The Apollo flights to the moon took place in low-Earth-orbit, which extends from about 160 to 2,000 km (about 100 to 1,250 miles).
D. Satellites keep a perpetual connection with a fixed antenna on the ground.