posted on Jul, 25 2005 @ 05:48 AM
-Swamp gas
-Solar eclipse
-Ball of lightning
-A gas plant on the sea (used to debunk the famous Mexico airforce tapes of UFO's)
-Meteors and comets of course
-Lightning
-Electromagnetic fields that influenced the brains of people so that they imagined things(also used to debunk ghosts)
-Garbage lid or something else thrown in the air
-The tape or photo was digitally altered
-Faulty radars
-All kinds of baloons or other exotic terrestial made flying objects
-The northern lights
-Sattelites
-Commersial or private airplanes
-A building on fire far away reflected in the low altitude clouds
-Ground lasers reflected on the clouds
-Light from cars replected on the clouds or light from cars of a hill
-Flares dropped from a military airplanes (debunked the Phoenix lights)
And if none of these fit, the debunkers just say "Unexplained atmosferic fenomenon", which is a scientists way of saying "I give up explaining it,
but you will never get me to say it's a UFO!".