We celebrate this week with the 50th anniversary of the Apollo 11 space mission, the first of its kind to land humans on the moon. Since then, we’ve returned to the moon about a dozen more times, making our indelible mark on a celestial body from which we did not come. In the process, we’ve littered the moon with lots of objects. Here are 10 things we should leave on the moon should alien lifeforms ever visit it.

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