There is a mirror on the moon - 18 inches square. If you shine a laser at it, it will reflect the photons back to you so you can calculate the distance to the moon. The mirror was place there by Neil Armstrong. The idea of shining of a laser so far away is crazy enough. The idea that it would actually reflect anything back is crazier still.
Just a marvelling fact today. That's it. I need sleep.
A song for this post.
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