Case file · Crop circle
Chilbolton 'Arecibo reply'
A formation resembling a reply to the 1974 Arecibo message appeared beside a radio telescope.
2001 CE · 51.14, -1.43 · status: hoax
The sceptical view
No one was seen making it, but analysts regard it as an elaborate human artwork.
The researched reading
A clever piece of field art: a reworked copy of the Arecibo message laid down overnight beside a radio telescope. The light-travel time alone makes a genuine reply impossible.
| Explanation | Weight | Why |
|---|---|---|
| A hoax or fabrication | 88% | The August 2001 pictogram copies the layout of the 1974 Arecibo message almost line for line, with edits a human designer would make (a changed figure, silicon added), and it appeared overnight in a field beside a road and a radio observatory, exactly where land artists like to work. Teams have demonstrated pictograms of this complexity with planks, rope and survey tapes since Bower and Chorley confessed in 1991. |
| Genuinely anomalous | 4% | A non-human reply would need a sender who received a 1974 radio burst aimed at a cluster 25,000 light-years away; physics alone rules out a reply within 27 years. |
| Something known, misidentified | 2% | Nothing was seen in the sky; the only role for misidentification is people reading a designed pattern as a signal because of where it lay. |
| Perception, memory or mind | 2% | The “reply” reading depends on wanting it to be one; the formation contains no information beyond a remix of the original message. |
| Secret human technology | 2% | A rumour that the observatory staff or a government made it as a test has no support and adds nothing over ordinary artists. |
| A known natural phenomenon | 1% | Wind and rain flatten crops in irregular lodging, never in a binary pixel grid. |
| A poorly understood natural phenomenon | 1% | Plasma-vortex theories proposed for simple circles in the 1980s cannot produce encoded diagrams. |
Official position: No official investigation; the observatory and most commentators treated it as a human-made artwork.