USA HISTORY

Detailed explanation-1: -astronomical observatory, any structure containing telescopes and auxiliary instruments with which to observe celestial objects.

Detailed explanation-2: -A new study suggests we start building them in the East. The world’s best astronomical observatories are mainly located in the Western Hemisphere, in high-altitude places like the summit of Mauna Kea in Hawaii, La Palma in the Canary Islands, and the Cerro Paranal summit in the Atacama Desert in Chile.

Detailed explanation-3: -Great Observatories, a semiformal grouping of four U.S. satellite observatories that had separate origins: the Hubble Space Telescope, the Compton Gamma Ray Observatory, the Chandra X-ray Observatory, and the Spitzer Space Telescope.

Detailed explanation-4: -The ideal locations for modern observatories are sites that have dark skies, a large percentage of clear nights per year, dry air, and are at high elevations. At high elevations, the Earth’s atmosphere is thinner, thereby minimizing the effects of atmospheric turbulence and resulting in better astronomical “seeing".