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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).
Arecibo Telescope in Puerto Rico with its 300 m (980 ft) dish was one of the world's largest filled-aperture (i.e. full dish) radio telescopes and conducted some SETI searches. MOP drew the attention of the United States Congress, where the program met opposition [27] and canceled one year after its start. [26]
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.
The longest-running full-scale SETI (search for extraterrestrial intelligence) project is the Ohio SETI Program at Ohio State University in Columbus, OH, which has searched the universe for extraterrestrial radio signals for 22 years, beginning in 1973. [5]
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.
The Wow! signal represented as "6EQUJ5". The original printout with Ehman's handwritten exclamation is preserved by Ohio History Connection. [1]The Wow! signal was a strong narrowband radio signal detected on August 15, 1977, by Ohio State University's Big Ear radio telescope in the United States, then used to support the search for extraterrestrial intelligence.
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The radio telescopes are sensitive enough to detect "Earth-leakage" levels of radio transmission from stars within 5 parsecs, [4] and can detect a transmitter of the same power as a common aircraft radar from the 1,000 nearest stars. [12] The Green Bank Telescope began operations in January 2016, and the Parkes Telescope from October 2016. [4]