| Apollo 11 crewmen Neil A. Armstrong and Edwin E. Aldrin, Jr., took their first historic steps on the moon on July 20, 1969. Armstrong is shown here stepping off the lunar module (LM). Aldrin followed him 20 minutes later. During their 2 hours 31 minutes outside the LM, the two men planted the United States flag, collected 22 kg (49 lb) of lunar rocks and soil, and deployed scientific equipment to study the solar wind and measure seismic tremors in the moon's interior and on its surface. |