What was that in the skies above Moscow on October 6, 2009?  Some have suggested that it is a weather phenomenon known as a fallstreak hole.  According to a Wikipedia article, fallstreak holes are created “when the water temperature in the clouds is below freezing but the water has not frozen yet due to the lack of ice nucleation particles.  When a portion of the water does start to freeze it will set off a domino effect…causing the water vapor around it to freeze and fall to the earth as well…leaving a large, often circular, hole in the cloud.”  Others, however, believe it to be a large alien spacecraft.  What do you think?  Let us know.