Left: Rarely seen: a "hole-punch" cloud seen over Alabama, US, in December last year. RIGHT: Another over Bribie Island, Australia.
'Hole in sky' amazes scientists
A giant hole that appeared in a uniform layer of cloud over Mobile, Alabama, in the US, has produced some intriguing photos.
Strictly speaking there is no scientific term for the apparition, and what exactly it is has been the subject of much meteorological speculation.
One hypothesis is that the hole is made by falling ice-crystals that could have come from the exhaust of a passing aircraft.
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