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"The Great Refractor of the Astrophysical Observatory Potsdam (AOP), Germany; it was finished in 1899."

H. Raab (User:Vesta), CC BY-SA 4.0, via Wikimedia Commons.

#telescope

"The Great Refractor of the Astrophysical Observatory Potsdam (AOP), Germany; it was finished in 1899." H. Raab (User:Vesta), CC BY-SA 4.0, via Wikimedia Commons.
#telescope

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