A part of a 5,000-pound Ritchey-Chretien reflecting telescope is lowered by crane through the roof of the Observatory at the U.S. Air Force Academy, October 2019. Workers from the 10th Civil Engineer Squadron and the Austrian telescope manufacturer company completed the first stage of a project to install the telescope into the facility. (Courtesy photo)

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Photo by: Courtesy photo |  VIRIN: 191016-F-RB000-001.JPG