Large light blue sphere, made no sound, and no light reflected off of it.

I just picked my mom up from work we were driving down our own street, and all at the same time we noticed a very large circular ball it was light blue in color, and was hovering over a local park (Loose Park), there was total snow covered ground, what I notice was there was no light reflecting off the snow, I could not belive this. I never believed in ufo's befor this night.  as we drove near the object it raised up and started moving away from us then it just shrinked up to a small dot and zoom away very fast it left a white streek in the sky,  My mom kept saying we need to call somebody about this, I reminded here that it was new years eve and that no one would belive it.  None of us where drinking at or befor that time. The following Monday I asked my astromer proffessor at U.M.K.C. If he believed in UFO's or alien life outside of our solor system, He responded that you would have to be extremly arrogent not too. I believe now.