its a Mini-Hot-Air-Ballon
Now that may explain the happenings in the tropical city of Darwin when at time there are reports of UFO's.
it seems mighty strange that it always happens during the wet season build up when every one has gone troppo, or is it that then is when the mangos come on?
Maybe it's been airforce personnel with too much time on their hands, and beer in their bellies.
others who claim to be in the know whisper dark things about, 'black plastic garbo bags and nun's candles'.???