Basically, in 1974, SETI sent a message to globular star cluster M13, some 22,800 light years away and consisting of some 300,000 stars in the constellation of Hercules; and in 2001 this “response” showed up as a crop formation.
The content of the message provided basic information about human life on Earth - which planet we are on in our solar system, what we generally look like, how tall we are, how many of us there are, the kind of instrument we sent the message with, the basic chemical building blocks of our genetics, and the helical spiral structure of our DNA.
The image of the Arecibo Telescope has been replaced by a totally different pattern, and the human has been modified by a stick figure that, while humanoid, has a far larger head.
The building block elements now include Silicon, atomic weight 14, in addition to the original elements listed.
There is now an extra strand on the right side of the DNA double-helix, and another, less obvious, change is in the binary coding of the number of nucleotides in DNA itself (in the center).
Human genome has 4,293,917,614, or nearly 4.3 billion nucleotide sequences, while the mystery genome sequence has 4,294,966,190, or 1,048,576 (one million) more nucleotide sequences than human DNA.
Finally, the diagram that depicts our solar system has been replaced with another that still has nine worlds, but planets 3 through 5 are lifted, and the last is drawn larger than the others or perhaps represents multiple moons. The fact that Jupiter’s moons are highlighted in a special diamond shape (see illustration below) should actually give SETI a way out of their self-created embarrassment.