Editing Wow! signal (section)

== Response ==
In 2012, on the 35th anniversary of the Wow! signal, [[Arecibo Observatory]] beamed a digital stream towards Hipparcos 34511, 33277, and 43587.<ref>{{Cite news |last=Noyes |first=Katherine |date=November 22, 2012 |title=Earth Replies to Space Signal After 35-Year Delay |url=https://www.technewsworld.com/story/76694.html |url-status=dead |archive-url=https://web.archive.org/web/20201130201504/https://www.technewsworld.com/story/76694.html |archive-date=November 30, 2020 |access-date=November 30, 2020 |work=TechNewsWorld}}</ref> The transmission consisted of approximately 10,000 Twitter messages solicited for the purpose by the [[National Geographic Channel]], bearing the [[hashtag]] "#ChasingUFOs" (a promotion for one of the channel's TV series).<ref name="wolchover" /> The sponsor also included a series of video vignettes featuring verbal messages from various celebrities.<ref name="spacedotcom">{{Cite news |last=Staff |date=August 12, 2012 |title=Humanity Responds to 'Alien' Wow Signal, 35 Years Later |url=http://www.space.com/17151-alien-wow-signal-response.html |work=Space.com}}</ref>

To increase the probability that any extraterrestrial recipients would recognize the signal as an intentional communication from another intelligent life form, Arecibo scientists attached a repeating-sequence [[Header (computing)|header]] to each individual message, and beamed the transmission at roughly 20 times the power of the most powerful commercial radio transmitter.<ref name="wolchover">{{Cite news |last=Wolchover |first=Natalie |date=2012-06-27 |title=Possible Alien Message to Get Reply from Humanity |url=https://www.livescience.com/21171-wow-signal-alien-message-reply.html |publisher=Discovery News}}</ref>