A spiral cloud, resembling a vapor trail from a jet or rocket launch, was spotted near a Ministry of Defence testing site on Salisbury Plain, one of Britain's best-known open spaces. The mist was spotted by David Hargrave, whilst he was walking his dog on Tuesday night. The cloud has left experts bewildered. (Photo/VCG)
A spiral cloud, resembling a vapor trail from a jet or rocket launch, was spotted near a Ministry of Defence testing site on Salisbury Plain, one of Britain's best-known open spaces. The mist was spotted by David Hargrave, whilst he was walking his dog on Tuesday night. The cloud has left experts bewildered. (Photo/VCG)