51 lines
2.2 KiB
Markdown
51 lines
2.2 KiB
Markdown
---
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title: "Cosmic Call"
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chunk: 1/1
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source: "https://en.wikipedia.org/wiki/Cosmic_Call"
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category: "reference"
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tags: "science, encyclopedia"
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date_saved: "2026-05-05T13:15:57.364030+00:00"
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instance: "kb-cron"
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---
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Cosmic Call was the name of two sets of interstellar radio messages that were sent from RT-70 in Yevpatoria, Ukraine in 1999 (Cosmic Call 1) and 2003 (Cosmic Call 2) to various nearby stars. The messages were designed with noise-resistant format and characters.
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The project was funded by Team Encounter, a Texas-based startup, which went out of business in 2004.
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Both transmissions were at ~150 kW, 5.01 GHz (FSK +/-24 kHz).
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== Message structure ==
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Each Cosmic Call 1 session had the following structure. The Scientific Part (DDM, BM, AM, and ESM) was sent three times (at 100 bit/s), and the Public Part (PP) was sent once (at 2000 bit/s), according to the following arrangement:
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DDM → BM → AM → ESM → DDM → BM → AM → ESM → DDM → BM → AM → ESM → PP,
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where DDM is the Dutil-Dumas Message, created by Canadian scientists Yvan Dutil and Stéphane Dumas, BM is the Braastad Message, AM is the Arecibo Message, and ESM is the Encounter 2001 Staff Message.
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Each Cosmic Call 2 session in 2003 had the following structure:
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DDM2 → DDM2 → DDM2 → AM → AM → AM → BIG → BIG → BIG → BM → ESM → PP,
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where DDM2 is modernized DDM (aka Interstellar Rosetta Stone, ISR), BIG is Bilingual Image Glossary. All but the PP were transmitted at 400 bit/s
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The ISR was 263,906 bits; BM, 88,687 bits, AM, 1,679 bits; BIG was 12 binary images 121,301 bits; ESM 24,899 bits. Total = 500,472 bits for 53 minutes. PP was 220 megabytes and sent at a rate of 100,000 bit/s for 11 hours total.
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== Error in Cosmic Call 1 ==
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The DDM incorrectly gave the neutron mass as 1.67392, instead of the known value of 1.67492. This error was corrected in DDM2.
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== Stars targeted ==
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The messages were sent to the following stars:
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== See also ==
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Arecibo message
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Active SETI
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Communication with extraterrestrial intelligence
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Interstellar messages
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== References ==
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== External links ==
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Self-Decoding Messages
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Discussion of the Call's "Rosetta Stone" and how it was developed
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Report on Cosmic Call
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Evpatoria 2003 discussion with bitmap and image |