radar telescopes

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• radio and radar astronomy — Study of celestial bodies by measuring the energy they emit or reflect at radio wavelengths. It began in 1931 with Karl Jansky s discovery of radio waves from an extraterrestrial source. After 1945, huge dish antennas, improved receivers and data …   Universalium

• History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …   Wikipedia

• Geology of Venus — Radar image of the surface of Venus, centered at 180 degrees east longitude Venus is a planet with striking surface characteristics. Most of what is known about its surface stems from radar observations, mainly images sent by the Magellan probe… …   Wikipedia

• telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… …   Universalium

• Jodrell Bank Observatory — The 76 m Lovell Telescope at Jodrell Bank Observatory …   Wikipedia

• Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …   Universalium

• warning system — ▪ military technology Introduction       in military science, any method used to detect the situation or intention of an enemy so that warning can be given.       Because military tactics from time immemorial have stressed the value of surprise… …   Universalium

• Satellite artificiel — Pour les articles homonymes, voir satellite et Sat. Le satellite de météorologie GOES O avant son lancement en orbite géostationnaire …   Wikipédia en Français

• Satellite d'astronomie — Satellite artificiel Pour les articles homonymes, voir satellite et Sat. Le satellite de météorologie GOES O avant son lancement en …   Wikipédia en Français

• Satellite scientifique — Satellite artificiel Pour les articles homonymes, voir satellite et Sat. Le satellite de météorologie GOES O avant son lancement en …   Wikipédia en Français

• Satellites artificiels — Satellite artificiel Pour les articles homonymes, voir satellite et Sat. Le satellite de météorologie GOES O avant son lancement en …   Wikipédia en Français