List of interstellar radio messages

This is a list of interstellar radio messages.

Classification of interstellar radio messages (IRMs)

There are eleven realized IRM projects:

The Across the Universe message, A Simple Response to an Elemental Message and Hello From Earth are not always considered serious. The first two of them were sent to Polaris, which is 431 light years distant from us and whose planetary system, even if it exists, may not be suited for life, because it is a supergiant star, spectral type F7Ib. In addition, both transmission rates were very high, about 128 kbit/s, for such moderate transmitter power (about 18 kW). The main defect of the "Hello From Earth" is an insufficient scientific and technical justification, since no famous SETI scientist made statements with validation of HFE's design. As it follows from : "After the final message was collected on Monday 24 August 2009, messages were exported as a text file and sent to NASA's Jet Propulsion Laboratory in California, where they were encoded into binary, packaged and tested before transmission", but nobody explained why he hopes that such encoded and packaged text will be understood and conceived by possible extraterrestrials.

Some use the term Active SETI Project, but Alexander Zaitsev, who was a scientific head of composing and transmissions of Cosmic Call 1999 & 2003, and Teen Age Message 2001, and a scientific consultant of A Message From Earth, emphasized that he considers above IRMs as the Messaging to Extra-Terrestrial Intelligence Projects.

These seven messages have targeted stars between 20 and 69 light-years from the Earth. The exception is the Arecibo message, which targeted globular cluster M13, approximately 24,000 light-years away. The first message to reach its destination will be A Message From Earth, which should reach Gliese 581 in Libra in 2029.

On 13 February 2015, scientists (including Geoffrey Marcy, Seth Shostak, Frank Drake, Elon Musk and David Brin) at a convention of the American Association for the Advancement of Science, discussed Active SETI and whether transmitting a message to possible intelligent extraterrestrials in the Cosmos was a good idea;[4][5] one result was a statement, (which was not signed by Seth Shostak, and Frank Drake), that a "worldwide scientific, political and humanitarian discussion must occur before any message is sent".[6]

Current transmissions en route

Stars to which messages were sent include:

Star Designation Constellation Date sent Arrival date Message
Messier 13 NGC 6205 Hercules November 16, 1974 approx. 25974Arecibo message
16 Cyg A HD 186408 Cygnus May 24, 1999 November 2069 Cosmic Call 1
15 Sge HD 190406 Sagitta June 30, 1999 February 2057
? HD 178428 Sagitta June 30, 1999 October 2067
Gl 777 HD 190360 Cygnus July 1, 1999 April 2051
? HD 197076 Delphinus August 29, 2001 February 2070 Teen Age Message
47 UMa HD 95128 Ursa Major September 3, 2001 July 2047
37 Gem HD 50692 Gemini September 3, 2001 December 2057
? HD 126053 Virgo September 3, 2001 January 2059
? HD 76151 Hydra September 4, 2001 May 2057
? HD 193664 Draco September 4, 2001 January 2059
? HIP 4872 Cassiopeia July 6, 2003 April 2036 Cosmic Call 2
? HD 245409 Orion July 6, 2003 August 2040
55 Cnc HD 75732 Cancer July 6, 2003 May 2044
? HD 10307 Andromeda July 6, 2003 September 2044
47 UMa HD 95128 Ursa Major July 6, 2003 May 2049
Polaris HIP 11767 Ursa Minor February 4, 2008 2439Across the Universe
Gliese 581 HIP 74995 Libra October 9, 2008 2029A Message From Earth
Gliese 581 HIP 74995 Libra August 28, 2009 2030Hello From Earth
Polaris HIP 11767 Ursa Minor October 10, 2016 2450A Simple Response to an Elemental Message

Along with serious IRM projects, a bulk of pseudo-METI[7] projects also exist:

References

  1. ↑ An Awkward History of Our Space Transmissions
  2. ↑ Reply To 'WOW! Signal' Gets Beamed Into Space
  3. ↑ "A Simple Response". European Space Agency official website. Retrieved 6 October 2016.
  4. ↑ Borenstein, Seth (of AP News) (13 February 2015). "Should We Call the Cosmos Seeking ET? Or Is That Risky?". New York Times. Retrieved 14 February 2015.
  5. ↑ Ghosh, Pallab (12 February 2015). "Scientist: 'Try to contact aliens'". BBC News. Retrieved 12 February 2015.
  6. ↑ Various (13 February 2015). "Statement - Regarding Messaging To Extraterrestrial Intelligence (METI) / Active Searches For Extraterrestrial Intelligence (Active SETI)". University of California, Berkeley. Retrieved 14 February 2015.
  7. ↑ Cooper, Keith (2010-05-03), SETI: Cosmic Call, Astronomy Now
  8. ↑ Gibbs, W. Wayt (2001), "Art as a Form of Life", Scientific American, Scientific American, 284 (4): 40, Bibcode:2001SciAm.284d..40G, doi:10.1038/scientificamerican0401-40
  9. ↑ Deep Space Network Frequently Asked Questions, Deep Space Communications Network
  10. ↑ List in Space: Calling the Cosmos Gets Commercial, Space_com
  11. ↑ Connecting with the Cosmos, CNES, 2006-01-26
  12. ↑ Doritos Makes History With World's First ET Advert, Spacedaily.com, 2008-06-13
  13. ↑ Chandler, David L. (2009-11-24), ET: Check your voicemail, MIT News
  14. ↑ Harris, Mark (2009-09-16), Is Sent Forever the worst Apollo 11 tie-in?, TechRadar
  15. ↑ Colvile, Robert (2010-02-09), Calling ET: Your chance to send a message to alien life, The Daily Telegraph

External links

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