The Gran Telescopio Canarias buildings at the Observatorio del Roque de los Muchachos on the island of La Palma (Canary Islands, Spain), considered the largest telescope in the world because of the size of its primary mirror.
Drawing of the Lick Telescope. Built in 1888, this is the third largest refracting telescope in the world [with refracting lenses of 91.4 cm (36 in.) in diameter], located on Mount Hamilton (east of San Jose, CA) at an altitude of 1280 m (4200 ft). (Library of Congress Prints and Photographs Division, Washington, D.C., reproduction no. LC-USZ62-11323)
Jupiter and its four planet-size moons, discovered by Galileo and thus called the Galilean satellites, photographed in 1979 by Voyager 1 and assembled into this collage. They are not to scale, but are in their relative positions. (NASA Jet Propulsion Laboratory)
Artist concept showing the Galileo spacecraft with inertial upper stage boosted into low Earth orbit by Atlantis, Orbiter Vehicle 104 (bottom right), in 1989. (NASA Johnson Space Center)
Telescope in Times Square, New York City, from 1933. (Gottscho-Schleisner Collection, Library of Congress Prints and Photographs Division, Washington, D.C., reproduction no. LC-G623-T01-19810)
