Which space exploration activity has most helped astronomers determine the age of the moon?

Answer 1

The space exploration activity that most helped astronomers determine the age of the moon is the collection and analysis of moon rocks brought back to Earth by the Apollo missions. The Apollo astronauts collected various samples of lunar rocks and brought them back to Earth for study. These rocks were found to be around 4.5 billion years old, which is the estimated age of the moon itself. By analyzing the composition and age of these moon rocks, astronomers were able to determine the age of the moon and gain valuable insights into the formation and evolution of our nearest celestial neighbor.