Green ball of light falling outta the sky in HELENA, MT.I was smoking my first morning cigarette outside on the patio at about 5:50am this morning. Heard a very loud sound that was similar to thunder, checked the sky, it couldn't be thunder. Decided it had to be a reallllly loud truck in the distance. But wait- there are no trucks around here. About a minute or less after I heard the loud sound in the sky, saw a bright falling thing that at first, I thought was a star I could make a wish on, then when I saw it was green I thought it was a plane going down. It got bigger and at the end of the three seconds looked like a big bright green (like the go light on a stoplight, but a little bigger) ball of light falling from the sky. It disappeared as soon as it hit the fog layer. (I live way up high above the fog)((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))