The Arecibo Message

Description:
The Arecibo message was an interstellar radio message containing information about life on our planet.  The message contained 1679 (semiprime) bits of information that could be organized into the graphic seen below.  The message contained information on our planetary system, genetic information, human dimensions, and the Arecibo telescope.

Web Resources:
Arecibo Message - Wikipedia

250px-Arecibo_message.svg.png
By Arne Nordmann (norro) (Own drawing, 2005) [GFDL, CC-BY-SA-3.0 or CC BY-SA 2.5 ], via Wikimedia Commons