high-earth orbit observatory

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• High Energy Astronomy Observatory 3 — The last of NASA s three High Energy Astronomy Observatories, HEAO 3 was launched 20 September 1979 on an Atlas Centaur launch vehicle, into a nearly circular, 43.6 degree inclination low Earth orbit with an initial perigee of 486.4 km.The normal …   Wikipedia

• High Energy Astrophysical Observatory — one of a series of three U.S. satellites launched (1977 79) into orbit around the earth and equipped with instruments for studying high energy phenomena, as x rays, gamma rays, and cosmic rays. Abbr.: HEAO * * * …   Universalium

• High Energy Astrophysical Observatory — one of a series of three U.S. satellites launched (1977 79) into orbit around the earth and equipped with instruments for studying high energy phenomena, as x rays, gamma rays, and cosmic rays. Abbr.: HEAO …   Useful english dictionary

• Low Earth orbit — An orbiting cannon ball showing various sub orbital and orbital possibilities …   Wikipedia

• High altitude nuclear explosion — High altitude nuclear explosions have historically been nuclear explosions which take place above altitudes of 50 km, still inside the Earth s atmosphere. Such explosions have been tests of nuclear weapons, used to determine the effects of the… …   Wikipedia

• Earth — This article is about the planet. For other uses, see Earth (disambiguation). Earth   …   Wikipedia

• Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

• Earth and Space Sciences — ▪ 1996 Introduction GEOLOGY AND GEOCHEMISTRY       In 1995 significant developments took place in the realm of geologic mapping, which provides the foundation for the presentation and comparison of data in the Earth sciences. The most important… …   Universalium

• Observatory — This article is about scientific observatories. For the suburb of Cape Town, see Observatory, Cape Town. For other uses, see The Observatory (disambiguation). The Sphinx Observatory at the Jungfraujoch in the Swiss Alps; high altitude… …   Wikipedia

• High Frequency Active Auroral Research Program — HAARP is often confused with Project HARP, the High Altitude Research Project (a joint project of The Pentagon and the Canadian Department of National Defence).The High Frequency Active Auroral Research Program (HAARP) is an investigation project …   Wikipedia

• Compton Gamma Ray Observatory — General information NSSDC ID 1991 027B Organization NASA …   Wikipedia