orbiting observatories

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• Orbiting Astronomical Observatory — Artist s conception of OAO 1 in orbit OAO 3 in the clean room The …   Wikipedia

• Great Observatories — ▪ United States satellite observatories   a semiformal grouping of four U.S. satellite observatories (satellite observatory) that had separate origins: the Hubble Space Telescope, the Compton Gamma Ray Observatory, the Chandra X ray Observatory,… …   Universalium

• Great Observatories program — Four Great Observatories satellites NASA s series of Great Observatories satellites are four large, powerful space based telescopes. Each of the Great Observatories has had a similar size and cost at program outset, and each has made a… …   Wikipedia

• Timeline of telescopes, observatories, and observing technology — Timeline of telescopes, observatories, and observing technology.Before Common Era (B.C.)2100*Xiangfen Astronomical Observatory, Xiangfen County, Linfen City, Shanxi Province, China 1100* 11th 7th century B.C., Zhou dynasty astronomical… …   Wikipedia

• astronomical observatory —       any structure containing telescopes and auxiliary instruments with which to observe celestial objects. Observatories can be classified on the basis of the part of the electromagnetic spectrum in which they are designed to observe. The… …   Universalium

• Spitzer, Lyman, Jr. — ▪ 1998       American astrophysicist (b. June 26, 1914, Toledo, Ohio d. March 31, 1997, Princeton, N.J.), advanced knowledge of the physical processes occurring in interstellar space and pioneered efforts to harness nuclear fusion as a source of… …   Universalium

• galaxy — /gal euhk see/, n., pl. galaxies. 1. Astron. a. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. b. (usually cap.) See Milky Way. 2. any large and brilliant or impressive… …   Universalium

• asteroid — asteroidal, adj. /as teuh royd /, n. 1. Also called minor planet. Astron. any of the thousands of small bodies of from 480 miles (775 km) to less than one mile (1.6 km) in diameter that revolve about the sun in orbits lying mostly between those… …   Universalium

• mercury — /merr kyeuh ree/, n., pl. mercuries. 1. Chem. a heavy, silver white, highly toxic metallic element, the only one that is liquid at room temperature; quicksilver: used in barometers, thermometers, pesticides, pharmaceutical preparations,… …   Universalium

• Pioneer program — The US Pioneer program of unmanned space missions was designed for planetary exploration. There were a number of such missions in the program, but the most notable were Pioneer 10 and Pioneer 11, which explored the outer planets and left the… …   Wikipedia

• TDRSS — The Tracking and Data Relay Satellite System (TDRSS) is a network of communications satellites (each called a Tracking and Data Relay Satellite or TDRS) and ground stations used by NASA for space communications. The system was designed to replace …   Wikipedia