As commander of Apollo 11, Armstrong was the first person to set foot on the Moon. With hundreds of millions watching a broadcast of his history-making moonwalk, he uttered the now famous line, “That’s one small step for [a] man, one giant leap for mankind.” Buzz Aldrin followed, and the two astronauts proceeded to set up scientific equipment, conduct experiments, and collect samples from the lunar surface. What other spacecraft landed on the moon while Apollo 11 was still there? Discuss