List of interstellar radio messages

This is a list of notable interstellar radio messages (IRMs) transmitted from Earth. Many of these were sent in the aim of searching for extra-terrestrial intelligence (SETI), and are often called 'active SETI' or 'METI' (Messages to Extra-Terrestrial Intelligence) projects.

This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources.

## Notable transmissions

[edit]

Stars to which messages were sent include:

Target  | Distance (ly)  | Sent  | Expected Arrival  | Message

|
|
|
|

Messier 13 | 25,000 | 16 November 1974 | 25974 | Arecibo message
Altair | 16.7  | 15 August 1983 | 2000  | A Message to Altair (CALL to the COSMOS'83) [1][2]
16 Cyg A | 69 | 24 May 1999 | 2068 | Cosmic Call 1
15 Sge | 57 | 30 June 1999 | 2056
? | 67 | 30 June 1999 | 2066
Gl 777 | 52 | 1 July 1999 | 2051
? | 68 | 29 August 2001 | 2069 | Teen Age Message
47 UMa | 46 | 3 September 2001 | 2047
37 Gem | 56 | 3 September 2001 | 2057
? | 57 | 3 September 2001 | 2058
? | 51 | 4 September 2001 | 2052
? | 57 | 4 September 2001 | 2058
Gliese 49 | 32 | 6 July 2003 | 2036 | Cosmic Call 2
Gliese 208 | 37 | 6 July 2003 | 2040
55 Cnc | 41 | 6 July 2003 | 2044
HD 10307 | 41 | 6 July 2003 | 2044
47 UMa | 46 | 6 July 2003 | 2049
Polaris | 433 | 4 February 2008 | 2439 | Across the Universe
Gliese 581 | 20.3 | 9 October 2008 | 2029 | A Message From Earth
Gliese 581 | 20.3 | 28 August 2009 | 2030 | Hello From Earth
TZ Arietis | 14.6  | 9 November 2009 | 2024  | RuBisCo Stars (RuBisCO genetic sequence)[3]
Teegarden's Star | 12.5  | 9 November 2009 | 2021
Kappa¹ Ceti | 29.8  | 10 November 2009 | 2039
HIP 34511  | 140[4] | 15 August 2012 | 2152  | Wow! Signal Reply[5]
37 Gem (HIP 33277) | 57[6] | 15 August 2012 | 2069
HIP 43587  | 41[7] | 15 August 2012 | 2053
Gliese 526 | 17.6  | 2013 | 2031  | Lone Signal
Polaris | 433 | 10 October 2016 | 2450 | A Simple Response to an Elemental Message[8]
Luyten b | 12.36 | 16 October 2017 | 2030 | Sónar Calling GJ273b[9][10]
14 May 2018 | 2031

## Other projects

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Some other projects include:

* Poetica Vaginal (1986)[11][12]
* Discovery Channel Message (2005)[citation needed]
* Craigslist Messages (2005)[13][14]
* CNES Cosmic Connexion (2006)[15]
* Doritos Advert (2008)[16]
* Sent Forever[17]
* Penguin UK[18]

Whilst not an interstellar message, it is also worth mentioning The Morse Message (1962),[19] which was sent to Venus.

## References

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1. ^ NAGAUCHI, Yosuke (12 May 2008). "【科学】届け宇宙人への電子メール ２５年前に送信、７年後にも返信来る！？ (1/2ページ)". MSN産経ニュース (MSN Sankei News) (in Japanese). Archived from the original on 17 May 2008. Retrieved 18 February 2025.
2. ^ Endo, Kazuki (20 August 2023). "'Anybody there?' Astronomers waiting for a reply from Altai". The Asahi Shimbun. Retrieved 18 February 2025.
3. ^ Chandler, David L. (24 November 2009), ET: Check your voicemail, MIT News
4. ^ "HIP 34511". simbad.u-strasbg.fr. Retrieved 18 February 2025.
5. ^ Memmott, Mark (15 August 2012). "Will E.T. Hear Us? Reply To 'WOW! Signal' Gets Beamed Into Space Today". NPR. Retrieved 18 February 2025.
6. ^ "HIP 33277". simbad.u-strasbg.fr. Retrieved 18 February 2025.
7. ^ "HIP 43587". simbad.u-strasbg.fr. Retrieved 18 February 2025.
8. ^ "A Simple Response". European Space Agency official website. 28 July 2016. Retrieved 6 October 2016.
9. ^ "How to send a message to another planet". The Economist. 16 November 2017. Retrieved 19 November 2017.
10. ^ "Sónar Calling GJ 273b". Sónar Calling. Sónar Music Festival. Retrieved 1 May 2021.
11. ^ "BIOMEDIALE". 13 February 2009. Archived from the original on 13 February 2009. Retrieved 9 March 2024.
12. ^ Gibbs, W. Wayt (1 April 2001). "Art as a Form of Life". Scientific American. doi:10.1038/scientificamerican0401-40. Archived (PDF) from the original on 20 June 2024. Retrieved 2 April 2025.
13. ^ Deep Space Network Frequently Asked Questions, Deep Space Communications Network, archived from the original on 4 January 2010
14. ^ List in Space: Calling the Cosmos Gets Commercial, Space_com, 23 March 2005
15. ^ Connecting with the Cosmos, CNES, 26 January 2006, archived from the original on 13 May 2010
16. ^ Doritos Makes History With World's First ET Advert, Spacedaily.com, 13 June 2008
17. ^ Harris, Mark (16 September 2009), Is Sent Forever the worst Apollo 11 tie-in?, TechRadar, archived from the original on 2 March 2010
18. ^ Colvile, Robert (9 February 2010), Calling ET: Your chance to send a message to alien life, The Daily Telegraph, archived from the original on 11 February 2010
19. ^ An Awkward History of Our Space Transmissions

## External links

[edit]

* Classification of interstellar radio messages
* Who Speaks for Earth?
* Earth calling: A short history of radio messages to ET
* Interstellar Radio Messages
* SETI: Terminating the transmission
* Self-Decoding Messages
* Breakthrough Message

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