Flourescent white-green 'fireball' from NW Corner of sky in IllinoisThis has been the third time I have seen this. The first time myself and another person saw it at the same location. The second was just myself and my brother and wife and children at a different location. And the third time myself.Always from the Northwest part of the sky, exactly at the same spot, we have seen a 'fireball' shoot down from the sky. It was extremely bright (like a fluorescent white) and also contained a greenish glow to it. This left no trace or trails. On the second observation the object DID 'shoot' back up in the same section of the sky approximately one hour later. No sounds, nothing out of the ordinary afterwards.I am an astronomer, and have seen VERY bright shooting stars ('fireballs' if you will). This was NOT one of those.The time and date given for this event is my THIRD viewing. The times for the other events were all around 10pm-12pm CST and each viewing was seperated by a period of years.