Multiple choice general knowledge science & technology How many American astronauts have explored the lunar surface? 1 3 12 24 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Twelve American astronauts walked on the lunar surface during the Apollo program (Apollo 11, 12, 14, 15, 16, and 17). Each mission had two astronauts who landed, while one remained in lunar orbit. No other nation has yet landed humans on the Moon.