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Amazon.com : Sky-Watcher Quattro 250P Imaging Newtonian - Large Aperture 10-inch Reflector Optical Tube for Astrophotography : Electronics
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Skywatcher Explorer-250PDS (OTA) 10" 250/1200MM F/4.7 Newtonian Reflector Telescope With 2" 1:10 Crayford - AliExpress
NASA History - The Newton X-ray Multi-Mirror (XMM) telescope was launched #OTD on this day (December 10) in 1999. The telescope was built by the European Space Agency (ESA) as a complement
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