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.
Over 45 immaterial artifacts have been identified.
| type | mission | sent to | quantity | length | distance (ly) | date/epoch (UTC) |
|---|---|---|---|---|---|---|
| Electromagnetic waves | HUMAN ELECTROMAGNETIC ACTIVITY BUBBLE | (all directions) | (constant) | about 70 | (since the 50's) | |
| Interstellar Radio Message (IRM) | MORSE MESSAGE | Librae | 1 | 2m 10s? | 61,42 | November 19, 1962 |
| Interstellar Radio Message (IRM) | MORSE MESSAGE | Librae | 1 | 5m 10s? | 61,42 | November 24, 1962 |
| Interstellar Radio Message (IRM) | ARECIBO MESSAGE | Herculis | 1 | less than 3 minutes | 49,42 | November 16, 1974 |
| Interstellar Radio Message (IRM) | ALTAIR MESSAGE | Aquilae | ? | ? | 40,67 | August 15, 1983 |
| Interstellar Radio Message (IRM) | POETICA VAGINAL | Eridani/Ceti | 1 | 20 minutes? | about 35 | (in 1986) |
| Interstellar Radio Message (IRM) | MESSAGES DES HOMMES A L'UNIVERS | Milky Way galaxy center | 1 | ? | 37,25 | January 26, 1987 |
| Interstellar Radio Message (IRM) | NASDA COSMIC COLLEGE | Virginis | ? | ? | 26,67 | August 19, 1997 |
| Interstellar Radio Message (IRM) | COSMIC CALL 1 (TEAM ENCOUNTER) | Cygni | 1 | 3h 55m | 24,92 | May 24, 1999 |
| Interstellar Radio Message (IRM) | COSMIC CALL 1 (TEAM ENCOUNTER) | Sagittae | 1 | 3h 55m | 24,75 | June 30, 1999 |
| Interstellar Radio Message (IRM) | COSMIC CALL 1 (TEAM ENCOUNTER) | Sagittae | 1 | 3h 55m | 24,75 | June 30, 1999 |
| Interstellar Radio Message (IRM) | COSMIC CALL 1 (TEAM ENCOUNTER) | Cygni | 1 | 3h 55m | 24,75 | July 1, 1999 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Delphini | 1 | 2h 12m | 22,58 | August 29, 2001 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Virginis | 1 | 2h 12m | 22,58 | September 3, 2001 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Ursae Majoris | 1 | 2h 12m | 22,58 | September 3, 2001 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Geminorum | 1 | 2h 12m | 22,58 | September 3, 2001 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Hydrae | 1 | 2h 12m | 22,58 | September 4, 2001 |
| Interstellar Radio Message (IRM) | TEEN AGE MESSAGE | Draconis | 1 | 2h 12m | 22,58 | September 4, 2001 |
| Interstellar Radio Message (IRM) | COSMIC CALL 2 (TEAM ENCOUNTER) | Cassiopeiae | 1 | 2h 05m | 20,75 | July 6, 2003 |
| Interstellar Radio Message (IRM) | COSMIC CALL 2 (TEAM ENCOUNTER) | Orionis | 1 | 2h 05m | 20,75 | July 6, 2003 |
| Interstellar Radio Message (IRM) | COSMIC CALL 2 (TEAM ENCOUNTER) | Cancri | 1 | 2h 05m | 20,75 | July 6, 2003 |
| Interstellar Radio Message (IRM) | COSMIC CALL 2 (TEAM ENCOUNTER) | Andromeda | 1 | 2h 05m | 20,75 | July 6, 2003 |
| Interstellar Radio Message (IRM) | COSMIC CALL 2 (TEAM ENCOUNTER) | Ursae Majoris | 1 | 2h 05m | 20,75 | July 6, 2003 |
| Interstellar Radio Message (IRM) | DISCOVERY CHANNEL MESSAGE | ? | ? | ? | about 16 | (in 2005?) |
| Interstellar Radio Message (IRM) | CRAIGSLIST MESSAGES (DEEP SPACE COMMUNICATIONS NETWORK) | ? | ? | ? | 19,08 | March 11, 2005 |
| Interstellar Radio Message (IRM) | CRAIGSLIST MESSAGES (DEEP SPACE COMMUNICATIONS NETWORK) | ? | ? | ? | about 16 | (in 2005?) |
| Interstellar Radio Message (IRM) | COSMIC CONNECTION (CNES AND ARTE) | Cephei | 1 | approx. 2h 40m? | 17,50 | September 30, 2006 |
| Interstellar Radio Message (IRM) | ACROSS THE UNIVERSE (BEATLE SONGS) | Ursae Minoris | 1 | 3m 48s | 16,17 | February 4, 2008 |
| Interstellar Radio Message (IRM) | MUSIK SKICKAS FRAN ESRANGE | Cassiopeiae | 1 | ? | 15,83 | June 4, 2008 |
| Interstellar Radio Message (IRM) | DORITOS ADVERTISEMENT | Ursae Majoris | 1 | 6h | 15,83 | June 12, 2008 |
| Interstellar Radio Message (IRM) | A MESSAGE FROM EARTH | Librae | 1 | 4h 30m | 15,50 | October 9, 2008 |
| Interstellar Radio Message (IRM) | HELLO FROM EARTH | Librae | 1 | ? | 14,58 | August 28, 2009 |
| Interstellar Radio Message (IRM) | FOREVERSENT | ? | ? | ? | about 12 | (in 2009?) |
| Interstellar Radio Message (IRM) | RUBISCO STARS | Arietis | 1 | approx. 15 min? | 14,42 | November 7, 2009 |
| Interstellar Radio Message (IRM) | RUBISCO STARS | Arietis | 1 | approx. 15 min? | 14,42 | November 7, 2009 |
| Interstellar Radio Message (IRM) | RUBISCO STARS | Ceti | 1 | approx. 15 min? | 14,42 | November 7, 2009 |
| Interstellar Radio Message (IRM) | THE EERIE SILENCE (PENGUIN BOOKS, NATIONAL SCIENCE & ENGINEERING WEEK UK) | Orion Nebula | 1 | ? | 14,08 | March 12, 2010 |
| Interstellar Radio Message (IRM) | WOW! REPLY | Geminorum | 1 | ? | 11,67 | August 15, 2012 |
| Interstellar Radio Message (IRM) | WOW! REPLY | Geminorum | 1 | ? | 11,67 | August 15, 2012 |
| Interstellar Radio Message (IRM) | WOW! REPLY | Cancri | 1 | ? | 11,67 | August 15, 2012 |
| Interstellar Radio Message (IRM) | LONE SIGNAL | Boötis | ? | ? | 10,75 | July 10, 2013 |
| Interstellar Radio Message (IRM) | JAXA SPACE CAMP (UDSC-1) | Cancri | 1 | ? | 10,58 | September 22, 2013 |
| Interstellar Radio Message (IRM) | JAXA SPACE CAMP (UDSC-2) | Cancri | 1 | ? | 9,67 | August 23, 2014 |
| Interstellar Radio Message (IRM) | A SIMPLE RESPONSE TO AN ELEMENTAL MESSAGE (ASREM) | Ursae Minoris | 1 | 14m 26s | 7,50 | October 10, 2016 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | Canis Majoris | 1 | 5m 30s | 6,50 | October 16, 2017 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | Canis Majoris | 1 | 5m 30s | 6,50 | October 17, 2017 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | Canis Majoris | 1 | 5m 30s | 6,50 | October 18, 2017 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | Canis Majoris | 1 | ? | 5,92 | May 14, 2018 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | Canis Majoris | 1 | ? | 5,92 | May 15, 2018 |
| Interstellar Radio Message (IRM) | SONAR CALLING GJ273b | Canis Majoris | 1 | ? | 5,92 | May 16, 2018 |
| Interstellar Radio Message (IRM) | STEPHEN HAWKING MEMORIAL BROADCAST | 1A 0620-00 black hole | 1 | 6m 30s | 5,83 | June 15, 2018 |