Two. Alan Shepard hit them February 6, 1971 right before they took off from the moon at the end of the Apollo 14 mission.
One day when I was in Junior High, we were playing Trivial Pursuit, and I was fascinated with one of the questions: "How many golf balls are there on the moon?" The back of the card said "three". I always remembered that, and would quote that little fact occasionally. I found out yesterday that it was wrong. There are two.
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