![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
![Amazon.com : OYS Telescope, Telescopes for Adults, 70mm Aperture 400mm AZ Mount, Telescope for Kids Beginners, Fully Multi-Coated Optics, Astronomy Refractor with Tripod, Phone Adapter, Backpack : Electronics Amazon.com : OYS Telescope, Telescopes for Adults, 70mm Aperture 400mm AZ Mount, Telescope for Kids Beginners, Fully Multi-Coated Optics, Astronomy Refractor with Tripod, Phone Adapter, Backpack : Electronics](https://m.media-amazon.com/images/I/61UEB9kImjS._AC_SX679_.jpg)
Amazon.com : OYS Telescope, Telescopes for Adults, 70mm Aperture 400mm AZ Mount, Telescope for Kids Beginners, Fully Multi-Coated Optics, Astronomy Refractor with Tripod, Phone Adapter, Backpack : Electronics
![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)