Earth is calling: the "puzzle"

Da "NASA - Picture of the Day", del 2 Aprile 2006:"If you could send a message to an Alien Civilization, what would you say? The people from the Cosmic Call Project sent the above image as the first page of a longer message. The message was broadcast toward local stars by radio telescope during the Summer of 1999. Another message was sent in 2003. The single-dish, 70 meter diameter telescope that send the messages is located in Ukraine on the Crimean peninsula near the town of of Evpatoria. This first page of the Cosmic Call 1999 message, shown above, involves only numbers and so is easier for puzzle solvers to decode than a more famous message broadcast toward distant star cluster M13 in 1974".