Some UFO sightings could be explained by ball lightning and other atmospheric phenomena, claims Australian astrophysicist Stephen Hughes.
The scientist has made a detailed study of an unusual event in 2006 when large meteors were observed over Brisbane.
Their appearance occurred at the same time as a brilliant green object was seen to roll over nearby mountains.
Dr Hughes has put forward a theory linking the object - presumed to be ball lighting - to the fireballs.
His idea is that one of the fireballs may have momentarily triggered an electrical connection between the upper atmosphere and the ground, providing energy for the ball lightning to appear above the hills.
Full Article Link from 1/12/2010
Its a very interesting read, well worth a look. I do believe after watching a few programs on the subject that at least some of the UFO stories could be explained by this