I saw winking object that was flying rapidly from west to east a winking object was flying from east toward west, which seemed as if it is orbiting the earth. The light of that was switching from red to silver alternately. It was moving as much rapidly that I had to keep track of that from an other window within a short time and I think the moving from south to east took something around 20 seconds and when it reached the east the light started to fading,or maybe it was due to weather condition that it seemed like fading to me...so I lost track of that.can it be something like an airplane or something like that from human made objects,or it's an UFO?