In the year 2029 an asteroid roughly a mile across.
Link:
http://www.space.com/spacewatch/050204_2004_mn4.html You will be able to see this phenomenon in Europe, Africa, and Asia.
How ever in the year 2036 the same asteroid will slam into our planet at a hypersonic speed . Its surface will glow so hot that it will not appear white but violet, you will not be able to see or hear this object. If you do see it then you are instantly dead when it touches the atmosphere.
It is still a small chance that it will hit, approximately 2.7%
2012 is bullstuff, this is real.