Editing Wow! signal (section)

== Searches for recurrence of the signal ==
Several attempts were made by Ehman and other astronomers to recover and identify the signal. The signal was expected to occur three minutes apart in each of the telescope's feed horns, but that did not happen.<ref name="space_com" /> Ehman unsuccessfully searched for recurrences using Big Ear in the months after the detection.<ref name="discovery">{{Cite news |title=The 'Wow!' Signal |url=http://news.discovery.com/space/alien-life-exoplanets/the-wow-signal-130524.htm |url-status=dead |archive-url=https://web.archive.org/web/20160507072801/http://news.discovery.com/space/alien-life-exoplanets/the-wow-signal-130524.htm |archive-date=May 7, 2016 |access-date=2016-07-02 |publisher=[[Discovery Channel]]}}</ref>

In 1987 and 1989, [[Robert H. Gray]] searched for the event using the META array at [[Oak Ridge Observatory]], but did not detect it.<ref name="discovery" /><ref name="gray_2012">{{Cite book |last=Gray |first=Robert H |title=The Elusive WOW: Searching for Extraterrestrial Intelligence |date=2012 |publisher=Palmer Square Press |isbn=978-0-9839584-4-4 |location=Chicago}}</ref>{{page needed|date=August 2020}} In a July 1995 test of signal detection software to be used in its upcoming [[Project Argus (SETI)|Project Argus]], SETI League executive director [[H. Paul Shuch]] made several drift-scan observations of the Wow! signal's coordinates with a 12-meter radio telescope at the [[National Radio Astronomy Observatory]] in [[Green Bank, West Virginia]], also achieving a [[null result]].

In 1995 and 1996, Gray again searched for the signal using the [[Very Large Array]], which is significantly more sensitive than Big Ear.<ref name="discovery" /><ref name="gray_2012" />{{page needed|date=August 2020}} Gray and Simon Ellingsen later searched for recurrences of the event in 1999 using the 26-meter radio telescope at the [[University of Tasmania]]'s [[Mount Pleasant Radio Observatory]].<ref name="gray_2002">{{Cite journal |last1=Gray |first1=Robert |last2=Ellingsen |first2=S. |year=2002 |title=A Search for Periodic Emissions at the Wow Locale |journal=The Astrophysical Journal |volume=578 |issue=2 |pages=967–71 |bibcode=2002ApJ...578..967G |doi=10.1086/342646 |doi-access=free}}</ref> Six 14-hour observations were made at positions in the vicinity, but nothing like the Wow! signal was detected.<ref name="space_com" /><ref name="gray_2012" />{{page needed|date=August 2020}}