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Arecibo message, computer artwork. This image was beamed into space by the Arecibo radio telescope on 16th November 1974. It was aimed at the globular star cluster M13, 25,000 light years away. The original image, which is not coloured, consists of a 73 row by 23 column grid and contains a binary message divided into seven parts. From the top down, and reading right to left, they are: numbers from ten to one (magenta), atomic numbers for phosphorus, oxygen, nitrogen, carbon and hydrogen (white), sugar and bases in nucleotides of DNA formulas (green), number of nucleotides in DNA (white), DNA double helix (light blue), population of Earth (pink), human figure (red), height of humans (dark blue), planets of the solar system with the Sun at far right (yellow), Arecibo telescope (orange) and dimensions (grey). The message was created by Frank Drake and Carl Sagan.

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