Onlookers enjoy Lowell Observatory's Clark Telescope in Flagstaff, AZ. Photo taken on April 10, 2011.
Lowell Observatory campus from above. Photo taken April 10, 2011.
At Lowell Observatory amateurs and enthusiasts can have the opportunity to look through telescopes with professional astronomers. Image released May 6, 2006.
A docent informs visitors about the Clark telescope during a tour at Lowell Observatory. Photo taken April 10, 2012.
The Lowell Observatory rotunda sits under stars. Photo taken July 5, 2005.
Originally from Boston, Massachusetts, Percival Lowell founded the observatory in 1894.
Astronomer Percival Lowell looks through the Clark Telescope.
Clyde Tombaugh, discoverer of Pluto, peers into an instrument.
Forty miles southeast of Flagstaff at the Happy Jack site, the DCT is complete. This 4.3-meter telescope rises seven stories above the top of a cinder cone. Photo taken October 19, 2009.
One of the first images captured by the Discovery Channel Telescope in Arizona shows the barred spiral galaxy M109. The privately funded observatory took its first photos in May 2012.
One of the first images taken by the Discovery Channel Telescope was of the Sombrero Galaxy, M104. The image was obtained April-May 2012.
One of the first images taken by the Discovery Channel Telescope was of the Whirlpool Galaxy, M51. The image was obtained April-May 2012.
The Discovery Channel Telescope dome with the Moon overhead. Photo taken April 17, 2012.
An artist's rendering of the Discovery Channel Telescope.
The Clark Telescope Dome at Lowell Observatory glows redly at night.
The moon shines above the Clark Telescope at the Lowell Observatory, Flagstaff, Arizona. File photo undated.
The Clark Telescope at Lowell Observatory is seen in detail. File photo undated.
The Clark Telescope stands in Lowell Observatory, Flagstaff, Arizona. File photo undated.