Hmmm Provided it was not a spontaneous phenomenon native to the planet which seems a remote possibility it was likely something to do with a meteorite I always thought that a meteorite was thought to have caused the effect which was centered in the air by the way but the HOW of it remains a mystery Still im not really high on it Please fill in other interesting impacts  Anders Trlind     Heres a question are bits of stuff that fall on other planets also called meteorites Or is this a geocentric term Dictionarycom seems to suggest this but doesnt say it explicitly one way or the other   Jul   PDT