This is the message with color added to highlight its separate parts. The actual binary transmission carried no color information. Frank Drake, then at Cornell University and creator of the Drake equation, wrote the message with message D’Arecibo PDF from Carl Sagan, among others. Arecibo message is viewed as a demonstration of human technological achievement, rather than a real attempt to enter into a conversation with extraterrestrials.
In fact, the core of M13, to which the message was aimed, will no longer be in that location when the message arrives. On 16 November 2018, Google released a Doodle to commemorate the 44th anniversary of the transmission. Even assuming that recipients would recognize binary, the encoding of the numbers may not be immediately obvious because of the way they have been written. To read the first seven digits, ignore the bottom row, and read them as three binary digits from top to bottom, with the top digit being the most significant.
The nucleotides are described as sequences of the five atoms that appear on the preceding line. 7 atoms of hydrogen, 5 atoms of carbon, 0 atoms of nitrogen, 1 atom of oxygen, and 0 atoms of phosphorus. The value depicted is around 4. 3 billion, which was believed to be the case in 1974 when the message was transmitted.
It is currently thought that there are about 3. The element in the center represents a human. Additionally, the human figure is shown just above the Earth graphic. In addition to showing position, the graphic provides a general, not-to-scale size reference of each planet and the Sun. The last part represents the Arecibo radio telescope with its diameter: 2,430 multiplied by the wavelength gives 306.