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This was recently posted on 9gag:

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In 1977, we received a signal from outer space, which lasted 72 seconds. We still do not know how or whence it came.

Did we receive such a signal in 1977?

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    Yes, we received many signals from outer space in 1977, including from the Viking landers on Mars and the Voyager spacecraft on their way to Jupiter. – Mark Adler May 14 '15 at 16:19
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    @MarkAdler as wells as many many more, for pulsars and stars and quasars and ... – Lyndon White May 15 '15 at 0:08
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    Why is there a frog in the picture? – gerrit May 10 '16 at 10:00
  • It is the small fact frog meme. – Remi.b May 10 '16 at 14:29
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Yes, there was a famous narrowband signal detected in 1977, which became known as the "Wow! signal". Whether it came from outer space is unknown.

  • The original astronomer wrote a 30th Anniversary Report on the signal in 2007, which covers a lot of the technical details.
  • Wikipedia adequately covers the topic.
  • Brian Dunning of the Skeptoid Podcast examined the evidence in 2012 to give a readable summary. In short, while its origins are unknown, and several conjectures have been rejected, there is no evidence that it came from aliens.
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    this wasn't the incident with the microwave? lol – Himarm May 14 '15 at 13:16
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    @Himarm: Nah, the microwave oven incident was more recent (past 17 years in Australia), but it illustrates the problem of jumping to conclusions about unknown signals. – Oddthinking May 14 '15 at 13:57
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    But if it did come from aliens, then they definitely look like blue frogs, right? – Steve Jessop May 15 '15 at 10:43

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