![The Clark Telescope, built in 1896, at Lowell Observatory in Flagstaff, Arizona | Library of Congress The Clark Telescope, built in 1896, at Lowell Observatory in Flagstaff, Arizona | Library of Congress](http://tile.loc.gov/storage-services/service/pnp/highsm/53300/53351v.jpg)
The Clark Telescope, built in 1896, at Lowell Observatory in Flagstaff, Arizona | Library of Congress
![The Vatican Advanced Technology Telescope (VATT), Mount Graham International Observatory, near Safford, Arizona, USA Stock Photo - Alamy The Vatican Advanced Technology Telescope (VATT), Mount Graham International Observatory, near Safford, Arizona, USA Stock Photo - Alamy](https://c8.alamy.com/comp/D2PT6E/the-vatican-advanced-technology-telescope-vatt-mount-graham-international-D2PT6E.jpg)
The Vatican Advanced Technology Telescope (VATT), Mount Graham International Observatory, near Safford, Arizona, USA Stock Photo - Alamy
![The Clark Telescope, built in 1896, at Lowell Observatory in Flagstaff, Arizona | Library of Congress The Clark Telescope, built in 1896, at Lowell Observatory in Flagstaff, Arizona | Library of Congress](http://tile.loc.gov/storage-services/service/pnp/highsm/53300/53352v.jpg)
The Clark Telescope, built in 1896, at Lowell Observatory in Flagstaff, Arizona | Library of Congress
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