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The number of rows in the Arecibo Message graphic. The Arecibo Message is a radio message that was sent toward a globular star cluster in Hercules from a radio telescope in Puerto Rico on November 16, 1974. The entire transmission lasted a semiprime number of seconds and provided a way for extraterrestrials to arrange a 73-by-23 array into recognizable data about our life and solar system.

Submitted: 2008-02-17 12:49:12; Last Modified: 2009-03-12 20:18:47.