Calling ET: Radio Message to M13

[M13 Message]

Globular cluster M13 was selected in 1974 as target for one of the first radio messages addressed to possible extra-terrestrial intelligent races, and sent by the big radio telescope of the Arecibo Observatory. Of course, this message will take about 25,000 years to reach the cluster, so that an answer cannot be expected for 50,000 years (thanks to Larry Klaes for this hint).

  • This message was featured as Astronomy Picture of the Day for July 17, 1997
  • ASP Teacher's Newsletter 20 contains some more background info.
  • Dead Link! The Search for Extraterrestrial Intelligence (SETI) by Alex Michael Bonnici

    Hartmut Frommert
    Christine Kronberg
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    Last Modification: May 23, 2013