In 1974, an interstellar radio message containing encoded information about the human race, DNA, ato
In 1974, an interstellar radio message containing encoded information about the human race, DNA, atomic numbers, Earth’s position and other information, was beamed from the Arecibo Observatory radio telescope towards globular cluster M13 and its 300,000 stars as an experiment in contacting potential extraterrestrial civilizations. Traveling at the speed of light, it will take 25,000 years to arrive. (Image Credit & Copyright: Adam Block, Mt. Lemmon SkyCenter, U. Arizona) -- source link
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