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• astrophysics refractors
• when was the first telescope created
• when did galileo first use the telescope
• who invented the first refracting telescope
• who was the first person to make a telescope
• according to some accounts the first optical telescope was accidentally invented in the 1600s
• diy astrophotography camera
• basic astrophotography setup
• who designed the first telescope
• telephoto astrophotography