The Arecibo message of November, 1974

Details The Arecibo message of November, 1974 The Arecibo message of November, 1974

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...26..462.&link_type=abstract

Icarus, vol. 26, Dec. 1975, p. 462-466.

Astronomy and Astrophysics

Astronomy

2

Interstellar Communication, Radio Astronomy, Radio Transmission, Astronomical Observatories, Deoxyribonucleic Acid, Extraterrestrial Life, Globular Clusters, Ultrahigh Frequencies

Scientific paper

On November 16, 1974, the Arecibo Observatory transmitted at 2380 MHz at an effective bandwidth of 10 Hz a message directed at the globular cluster M13. The message consists of a 1679-bit picture portraying a counting scheme, five biologically significant atoms (H, C, O, N, and P), the generic structure of the four purines and pyrimidine bases of DNA; a schematic of the DNA double helix with an order-of-magnitude estimate of the number of base pairs; a representation of a human being and his or her dimensions; a depiction of the solar system with an indication that human beings inhabit the third planet and an estimate of the human population of the earth; and finally, a schematic representation of the Arecibo Observatory and a description of its dimensions.

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