On Tuesday 21st August 2001 two new crop formations were reported near Chilbolton radio telescope in Hampshire, UK. Both were very impressive looking and consisted of a large number of small 'pixels', which when viewed from the air formed a recognisable shape - unlike many other crop formations.

One represented a 'human face' and the other resembled a radio transmission that SETI (the Search for Extra-Terrestrial Intelligence) sent from the Arecibo radio telescope in 1974. This latter formation will be examined in this article, in which I hope to not only describe and explain the original transmission, but also to examine and decode a number of significant changes occurring in the crop formation.

After speaking to witnesses, it would appear that the 'Arecibo' formation was created on August 20th. Although I could roughly make out the binary pattern of the formation from aerial photographs, some aspects were not quite clear enough to discern individual 'digits'. Therefore I visited both formations myself (they are about 200m apart in the same field) on Saturday 25th August 2001.

The Arecibo message

First, I will give some background to the original message sent from Arecibo, back in 1974.

Arecibo is on the northern coast of Puerto Rico and contains a natural disc-shaped hole in the rock. Inside this bowl was constructed the world's largest radio-telescope, with a diameter of 1000 feet.

In 1974 a number of modifications had been carried out to the transmitter, enabling it to broadcast signals at a power of up to 20 terawatts (1 terawatt = 1 trillion watts) and as an inaugural test of these improvements it was decided by SETI to transmit an encoded message to the heavens. This signal was aimed towards the globular star cluster M13, some 25,000 light years away and consisting of some 300,000 stars in the constellation of Hercules.

The message was actually transmitted on November 16th 1974 and consisted of 1679 pulses of binary code (0's and 1's) - which took a little under three minutes to transmit. It was transmitted on a frequency of 2380MHz (which is significant later).


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