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The Allen Telescope Array (ATA), formerly known as the One Hectare Telescope (1hT), is a radio telescope array dedicated to astronomical observations and a simultaneous search for extraterrestrial intelligence (SETI).
In the SETI context, the name has been used for radio telescopes in fiction (Arthur C. Clarke, "Imperial Earth"; Carl Sagan, "Contact"), was the name initially used for the NASA study ultimately known as "Cyclops," and is the name given to an omnidirectional radio telescope design being developed at the Ohio State University. [80]
This is a list of radio telescopes – over one hundred – that are or have been used for radio astronomy. The list includes both single dishes and interferometric arrays. The list is sorted by region, then by name; unnamed telescopes are in reverse size order at the end of the list. The first radio telescope was invented in 1932, when Karl ...
SETI@home searches for possible evidence of radio transmissions from extraterrestrial intelligence using observational data from the Arecibo radio telescope and the Green Bank Telescope. [14] The data is taken "piggyback" or "passively" while the telescope is used for other scientific programs.
The Berkeley SETI Research Center also hosts the Breakthrough Listen program, [4] [5] [6] which is a ten-year initiative with $100 million funding begun in July 2015 to actively search for intelligent extraterrestrial communications in the universe, in a substantially expanded way, using resources that had not previously been extensively used for the purpose.
Since its completion in November 1963, the Telescope had been used for radar astronomy and radio astronomy, and had been part of the Search for extraterrestrial intelligence (SETI) program. It was also used by NASA for Near-Earth object detection. Since around 2006, NSF funding support for the telescope had waned as the Foundation directed ...
The SETI Institute started a refurbishment and upgrade program for the ATA in 2019, and in 2020 it also took over the operation of the observatory from SRI. The earliest experiments in millimeter-wave astronomy were performed at this site starting in the 1970s when a 2-element interferometer was constructed.
From 1965–1971, the Big Ear was used to map wideband radio sources for the Ohio Sky Survey, its first sky survey for extraterrestrial radio sources. [2] The Wow! signal represented as "6EQUJ5" on the original computer printout. In 1977, the Big Ear recorded an unusual and possible extraterrestrial radio signal, which became known as the Wow ...