Non-exhaustive list of intangible proof of our presence into interstellar space:
an ever-growing Earth-centered electromagnetic bubble created in the early 50’s (radio and television broadcasts, radar and nuclear explosions pulses, etc.);
brief radio messages we’ve beamed to the stars since the 60’s and also known as Active SETI (Active Search for Extraterrestrial Intelligence) or METI (Messages for Extraterrestrial Intelligence) broadcastings.
As these immaterial artifacts are travelling at the speed of light, they are the furthest witnesses of our existence, way beyond our solar system. However and despite their strength, the signals will gradually faint with the distance. It is highly probable that they will never reach their target unscathed and intelligible.
Over 50 immaterial artifacts have been identified.
| type | mission | sent from | sent to | quantity | length | distance (ly) | date/epoch (UTC) |
|---|---|---|---|---|---|---|---|
| Electromagnetic waves | HUMAN ELECTROMAGNETIC ACTIVITY BUBBLE | (all Earth) | (all directions) | (constant) | 75,42 | (since the 50's) | |
| Interstellar Radio Message (IRM) | MORSE MESSAGE | Yevpatoria Deep Space Center radio telescope, Ukraine | Librae | 1 | 2m 10s? | 62,50 | November 19, 1962 |
| Interstellar Radio Message (IRM) | MORSE MESSAGE | Yevpatoria Deep Space Center radio telescope, Ukraine | Librae | 1 | 5m 10s? | 62,50 | November 24, 1962 |
| Interstellar Radio Message (IRM) | ARECIBO MESSAGE | Arecibo radio telescope, Puerto Rico | Herculis | 1 | less than 3 minutes | 50,50 | November 16, 1974 |
| Interstellar Radio Message (IRM) | ALTAIR MESSAGE | ? | Aquilae | ? | ? | 41,75 | August 15, 1983 |
| Interstellar Radio Message (IRM) | POETICA VAGINAL | Millstone Hill Observatory, US | Eridani/Ceti | 1 | 20 minutes? | 38,92 | (in 1986) |
| Interstellar Radio Message (IRM) | MESSAGES DES HOMMES À L’UNIVERS | Nançay Radio Telescope, France | Milky Way galaxy center | 1 | ? | 38,33 | January 26, 1987 |
| Interstellar Radio Message (IRM) | NASDA COSMIC COLLEGE | ? | Virginis | ? | ? | 27,75 | August 19, 1997 |
| Interstellar Radio Message (IRM) | COSMIC CALL 1 (TEAM ENCOUNTER) | Yevpatoria Deep Space Center radio telescope, Ukraine | Cygni | 1 | 3h 55m | 26,00 | May 24, 1999 |
| Interstellar Radio Message (IRM) | COSMIC CALL 1 (TEAM ENCOUNTER) | Yevpatoria Deep Space Center radio telescope, Ukraine | Sagittae | 1 | 3h 55m | 25,92 | June 30, 1999 |
| Interstellar Radio Message (IRM) | COSMIC CALL 1 (TEAM ENCOUNTER) | Yevpatoria Deep Space Center radio telescope, Ukraine | Sagittae | 1 | 3h 55m | 25,92 | June 30, 1999 |
| Interstellar Radio Message (IRM) | COSMIC CALL 1 (TEAM ENCOUNTER) | Yevpatoria Deep Space Center radio telescope, Ukraine | Cygni | 1 | 3h 55m | 25,92 | July 1, 1999 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Yevpatoria Deep Space Center radio telescope, Ukraine | Delphini | 1 | 2h 12m | 23,75 | August 29, 2001 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Yevpatoria Deep Space Center radio telescope, Ukraine | Virginis | 1 | 2h 12m | 23,75 | September 3, 2001 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Yevpatoria Deep Space Center radio telescope, Ukraine | Ursae Majoris | 1 | 2h 12m | 23,75 | September 3, 2001 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Yevpatoria Deep Space Center radio telescope, Ukraine | Geminorum | 1 | 2h 12m | 23,75 | September 3, 2001 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Yevpatoria Deep Space Center radio telescope, Ukraine | Hydrae | 1 | 2h 12m | 23,75 | September 4, 2001 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Yevpatoria Deep Space Center radio telescope, Ukraine | Draconis | 1 | 2h 12m | 23,75 | September 4, 2001 |
| Interstellar Radio Message (IRM) | COSMIC CALL 2 (TEAM ENCOUNTER) | Yevpatoria Deep Space Center radio telescope, Ukraine | Cassiopeiae | 1 | 2h 05m | 21,92 | July 6, 2003 |
| Interstellar Radio Message (IRM) | COSMIC CALL 2 (TEAM ENCOUNTER) | Yevpatoria Deep Space Center radio telescope, Ukraine | Orionis | 1 | 2h 05m | 21,92 | July 6, 2003 |
| Interstellar Radio Message (IRM) | COSMIC CALL 2 (TEAM ENCOUNTER) | Yevpatoria Deep Space Center radio telescope, Ukraine | Cancri | 1 | 2h 05m | 21,92 | July 6, 2003 |
| Interstellar Radio Message (IRM) | COSMIC CALL 2 (TEAM ENCOUNTER) | Yevpatoria Deep Space Center radio telescope, Ukraine | Andromeda | 1 | 2h 05m | 21,92 | July 6, 2003 |
| Interstellar Radio Message (IRM) | COSMIC CALL 2 (TEAM ENCOUNTER) | Yevpatoria Deep Space Center radio telescope, Ukraine | Ursae Majoris | 1 | 2h 05m | 21,92 | July 6, 2003 |
| Interstellar Radio Message (IRM) | DISCOVERY CHANNEL MESSAGE | ? | ? | ? | ? | 19,92 | (in 2005?) |
| Interstellar Radio Message (IRM) | CRAIGSLIST MESSAGES (DEEP SPACE COMMUNICATIONS NETWORK) | ? | ? | ? | ? | 20,17 | March 11, 2005 |
| Interstellar Radio Message (IRM) | CRAIGSLIST MESSAGES (DEEP SPACE COMMUNICATIONS NETWORK) | ? | ? | ? | ? | 19,92 | (in 2005?) |
| Interstellar Radio Message (IRM) | COSMIC CONNECTION (CNES AND ARTE) | Issus Aussaguel station, France | Cephei | 1 | approx. 2h 40m? | 18,67 | September 30, 2006 |
| Interstellar Radio Message (IRM) | ACROSS THE UNIVERSE (BEATLE SONGS) | Madrid Deep Space Communication Complex, Spain | Ursae Minoris | 1 | 3m 48s | 17,33 | February 4, 2008 |
| Interstellar Radio Message (IRM) | MUSIK SKICKAS FRAN ESRANGE | Esrange Space Center, Sweden | Cassiopeiae | 1 | ? | 17,00 | June 4, 2008 |
| Interstellar Radio Message (IRM) | DORITOS ADVERTISEMENT | EISCAT, Norway | Ursae Majoris | 1 | 6h | 16,92 | June 12, 2008 |
| Interstellar Radio Message (IRM) | A MESSAGE FROM EARTH | Yevpatoria Deep Space Center radio telescope, Ukraine | Librae | 1 | 4h 30m | 16,58 | October 9, 2008 |
| Interstellar Radio Message (IRM) | HELLO FROM EARTH | Canberra DeepSpace Communication Complex, Australia | Librae | 1 | ? | 15,75 | August 28, 2009 |
| Interstellar Radio Message (IRM) | FOREVERSENT | ? | ? | ? | ? | 15,92 | (in 2009?) |
| Interstellar Radio Message (IRM) | RUBISCO STARS | Arecibo radio telescope, Puerto Rico | Arietis | 1 | approx. 15 min? | 15,58 | November 7, 2009 |
| Interstellar Radio Message (IRM) | RUBISCO STARS | Arecibo radio telescope, Puerto Rico | Arietis | 1 | approx. 15 min? | 15,58 | November 7, 2009 |
| Interstellar Radio Message (IRM) | RUBISCO STARS | Arecibo radio telescope, Puerto Rico | Ceti | 1 | approx. 15 min? | 15,58 | November 7, 2009 |
| Interstellar Radio Message (IRM) | THE EERIE SILENCE (PENGUIN BOOKS, NATIONAL SCIENCE & ENGINEERING WEEK UK) | Goonhilly Earth Station, UK | Orion Nebula | 1 | ? | 15,17 | March 12, 2010 |
| Interstellar Radio Message (IRM) | WOW! REPLY | Arecibo radio telescope, Puerto Rico | Geminorum | 1 | ? | 12,75 | August 15, 2012 |
| Interstellar Radio Message (IRM) | WOW! REPLY | Arecibo radio telescope, Puerto Rico | Geminorum | 1 | ? | 12,75 | August 15, 2012 |
| Interstellar Radio Message (IRM) | WOW! REPLY | Arecibo radio telescope, Puerto Rico | Cancri | 1 | ? | 12,75 | August 15, 2012 |
| Interstellar Radio Message (IRM) | LONE SIGNAL | Jamesburg Earth Station, US | Boötis | ? | ? | 11,83 | July 10, 2013 |
| Interstellar Radio Message (IRM) | JAXA SPACE CAMP (UDSC-1) | Usuda Deep Space Center, Japan | Cancri | 1 | ? | 11,67 | September 22, 2013 |
| Interstellar Radio Message (IRM) | JAXA SPACE CAMP (UDSC-2) | Usuda Deep Space Center, Japan | Cancri | 1 | ? | 10,75 | August 23, 2014 |
| Interstellar Radio Message (IRM) | A SIMPLE RESPONSE TO AN ELEMENTAL MESSAGE (ASREM) | DSA 2 ESTRACK radio antenna, Spain | Ursae Minoris | 1 | 14m 26s | 8,58 | October 10, 2016 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | EISCAT, Norway | Canis Majoris | 1 | 5m 30s | 7,58 | October 16, 2017 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | EISCAT, Norway | Canis Majoris | 1 | 5m 30s | 7,58 | October 17, 2017 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | EISCAT, Norway | Canis Majoris | 1 | 5m 30s | 7,58 | October 18, 2017 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | EISCAT, Norway | Canis Majoris | 1 | ? | 7,00 | May 14, 2018 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | EISCAT, Norway | Canis Majoris | 1 | ? | 7,00 | May 15, 2018 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | EISCAT, Norway | Canis Majoris | 1 | ? | 7,00 | May 16, 2018 |
| Interstellar Radio Message (IRM) | STEPHEN HAWKING MEMORIAL BROADCAST | DSA 2 ESTRACK radio antenna, Spain | 1A 0620-00 black hole | 1 | 6m 30s | 6,92 | June 15, 2018 |
| Interstellar Radio Message (IRM) | MESSAGE TO VOYAGER | DSS63 radio antenna, Spain | Voyager 1 deep space probe | 1 | 28s | 0,75 | September 6, 2024 |