radar astronomy
21Histoire du radar — Principe du sondage radar L’histoire du radar est une branche de l histoire de l électronique qui devient un des fondements de la stratégie militaire du XXe siècle. L’idée de repérer un objet à distance, la télédétection, a commencé au début …
22Synthetic aperture radar — (SAR) is a form of radar in which the highly directional (and thus very large) rotating antenna used by conventional radar is replaced with many low directivity small stationary antenna positions scattered over some area near or around the target …
23Timeline of astronomy — Timeline of astronomy2500 BCMany ancient sites are thought to have astronomical significance, such as the Ancient Egyptian pyramids, Harappan shell instruments, British megaliths, and buildings in China and Latin America.In Lothal, the ancient… …
24H2S radar — The H2S radar was used in bombers of RAF Bomber Command. It was designed to identify targets on the ground for night and all weather bombing. The transmitter/receiver equipment was officially known as TR3159 (H2S Mk I/ASV VIB) or TR3191 (H2S Mk… …
25Aurora (astronomy) — Aurora Borealis redirects here. For other uses, see Aurora Borealis (disambiguation). Aurora Australis redirects here. For the ship, see Aurora Australis (icebreaker). For the book, see Aurora Australis (book). Northern lights redirects here. For …
26radartelescope — radar telescope n. A large radar antenna used in radar astronomy. * * * …
27radarastronomy — radar astronomy n. The branch of astronomy that studies bodies in the solar system by analyzing the reflections of radio waves sent from Earth. * * * …
28Mercury (planet) — Mercury  ☿ …
29Arecibo Observatory — Arecibo Radio Telescope Organization SRI International, NSF, Cornell University Location …
30telescope — /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… …
