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Astronomijos Wiki
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===Radio telescopes=== {{main|Radio telescope}} [[Image:USA.NM.VeryLargeArray.02.jpg|thumb|right|200px|The [[Very Large Array]] at Socorro, New Mexico, United States.]] Radio telescopes are [[Directional antenna|directional]] [[radio antennas]] that often have a parabolic shape. The dishes are sometimes constructed of a conductive wire mesh whose openings are smaller than the [[wavelength]] being observed. Multi-element [[Radio telescope]]s are constructed from pairs or larger groups of these dishes to synthesize large 'virtual' apertures that are similar in size to the separation between the telescopes; this process is known as [[aperture synthesis]]. As of 2005, the current record array size is many times the width of the [[Earth]]—utilizing space-based [[Very Long Baseline Interferometry]] (VLBI) telescopes such as the [[Japan]]ese [[HALCA]] (Highly Advanced Laboratory for Communications and Astronomy) [http://www.vsop.isas.ac.jp/ VSOP (VLBI Space Observatory Program) satellite]. Aperture synthesis is now also being applied to optical telescopes using [[Optical interferometry#Astronomical Optical Interferometry|optical interferometers]] (arrays of optical telescopes) and [[aperture masking interferometry]] at single reflecting telescopes. Radio telescopes are also used to collect [[microwave radiation]], which is used to collect radiation when any visible light is obstructed or faint, such as from [[quasar]]s. Some radio telescopes are used by programs such as [[Search for Extraterrestrial Intelligence|SETI]] and the [[Arecibo Observatory]] to search for exterrestrial life. One particularly exciting example is the [[Wow! signal]], recorded in 1977.
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