![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 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](https://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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File:University of Arizona 0 9-meter Spacewatch Telescope (UArizona09m-Spacewatch-Telescope-CC).jpg - Wikimedia Commons
![File:University of Arizona 1 8-meter Spacewatch Telescope (UArizona18mSpacewatchTelescope-CC).jpg - Wikimedia Commons File:University of Arizona 1 8-meter Spacewatch Telescope (UArizona18mSpacewatchTelescope-CC).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/a/ab/University_of_Arizona_1_8-meter_Spacewatch_Telescope_%28UArizona18mSpacewatchTelescope-CC%29.jpg)