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celestron.com
69v08
TIL the Apollo 12, 16, and 17 American flags planted on the moon are the only flags left that are only visible from earth using the Lunar Reconnaissance Oribiter.
Lkrw0
TIL It is not necessary to clean the lens or mirror of a telescope if it just has a few visible specks of dust. Overly frequent or aggressive cleaning can actually damage and prematurely age the special coatings on mirrors and lenses–permanently degrading their performance