Asteroid And Comet Tracking Agency

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• Asteroid deflection strategies — are methods by which near Earth objects could be diverted, preventing potentially catastrophic impact events. A sufficiently large impact would cause massive tsunamis and/or, by placing large quantities of dust into the stratosphere blocking… …   Wikipedia

• Asteroid-impact avoidance — Planetary defense redirects here. For defending against alien invasion in fiction, see alien invasion. Artist s impression of a major impact event. The collision between Earth and an asteroid a few kilometres in diameter releases as much energy… …   Wikipedia

• Asteroid — For the arcade video game, see Asteroids (video game). For other uses, see Asteroid (disambiguation). A composite image, to scale, of the asteroids that have been imaged at high resolution. As of 2011 they are, from largest to smallest: 4 Vesta,… …   Wikipedia

• Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics       Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity.       Computer scientist Manindra Agrawal of the… …   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

• ACTA — Adrenocorticotropic Hormone (Medical » Physiology) * American Council Of Trustees And Alumni (Academic & Science » Universities) * Association De Coordination Technique Agricole (International » French) * Administrative Council For Terminal… …   Abbreviations dictionary

• Japan Aerospace Exploration Agency — 宇宙航空研究開発機構 Reaching for the skies, exploring space Owner  Jap …   Wikipedia

• List of astronomy acronyms — This is a compilation of acronyms commonly used in astronomy. Most of the acronyms are drawn from professional astronomy and are used quite frequently in scientific publications. However, a few of these acronyms are frequently used by the general …   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

• 99942 Apophis — Discovery[2] Discovered by Roy A. Tucker David J. Tholen Fabrizio Bernardi Discovery site Kitt Peak …   Wikipedia

• Duncan Steel — Dr Duncan I. Steel, BSc, MSc, DIC, PhD, FRAS (born 11 June 1955), is a British/Australian scientist born in Midsomer Norton, Somerset. He is a world renowned space science authority who has worked with NASA to assess the threat of comet and… …   Wikipedia