Arecibo answer

The woo is out there UFOlogy

Aliens did it...

George Adamski Norwegian Spiral Robert France Die Glocke Wedge of Aiud Falacia de atribución

...and ran away

Out-of-place artifact Conehead skulls Yonaguni Monument Le Livre des Secrets Trahis Ra Material Jaime Maussán v - t - e

The "Arecibo answer" is a crop circle (well, crop rectangle, to be accurate) that is purported to be a response to the "Arecibo message", a piece of coded information about Earth and humanity which was first beamed into space in 1974. It appeared in 2001 near the Chilbolton radio telescope in Hampshire, UK. Despite the fact crop circles are known to be hoaxes, people still believe that this is key evidence of extraterrestrial presence on Earth. At the time of this hoax, the usual suspect came out of the woodworks to claim that this is "undeniable proof!!!!" that aliens have contacted us. Amidst all this madness, SETI had to actually come out and spell it out that the obvious hoax is indeed an obvious hoax.

The response

The crop circle is a near replica of the Arecibo message, which contained various pieces of information such as the numbers of chemical elements, the composition of DNA, the position of Earth in the Solar System, and a depiction of a human being. The "answer" itself doesn't expand much upon this and still forms the same 23 x 73 grid (because these numbers are primes) and most of the chemical data remains the same. The changes to the message to create the response are straight from existing alien folklore and science fiction. In the section detailing important chemical elements, the main focus is altered from carbon to silicon, and the diagram of DNA is re-scribbled slightly. At the bottom, the pictogram of a human is replaced with a shorter figure with a large, bulbous head. This is a clear reference to the "grey" type of alien, and as a depiction could only be something that a human came up with.

Note also the obvious representation of the Flying Spaghetti Monster… four years before Bobby Henderson’s letter to the Kansas School Board. Oo-wee-oo!

Reality check

The likelihood of the Arecibo message ever being picked up is very, very low. It was aimed at globular star cluster M13, which is 25,000 light years away. In fact, it's so far away that in 25,000 years when it finally reaches its destination, its destination will have, in fact, moved! The message was only intended as a demonstration of the transmission technology, not as a serious attempt to make contact.

The message does also pass close enough to a few nearby stars to have been potentially "received" in their vicinity. But why wouldn't the recipients simply send back a message via radio, instead of coming here and messing up some poor farmer's crops at night and then sneaking away?

A colourised mosaic showing the Arecibo message. (The original was transmitted as a series of 1s and 0s, so a black-and-white image is more appropriate, but less readable).

A colourised mosaic of the "answer". Again, a black-and-white mosaic would be more appropriate, but less readable, as the "answer" was made by flattening squares of crops.

See also

• Alien abduction