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How big does a mirror placed on the Moon have to be to create a reflection of the Sun, visible to the naked eye?
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I know that in the past mirrors were used to make long distance topographical measurements at the top of mountains, the record is 309 km (192 miles) using a 22 cm (8") mirror. With the naked eye, with a mirror of 3" you can see up to 40 miles . To do the same thing on the Moon, how big would the mirror have to be?
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