Why are UFOs haunting the International Space Station – sightings on the rise?

Are UFOs haunting the International Space Station (ISS)?  If the UFO enthusiasts are to be believed, it seems that ISS has seen an increasing activities of the UFO flying around.

Videos have cropped up on YouTube showing images taken by NASA cameras of objects of different shapes, some moving very slowly, others rapidly hurtling through space.  What, exactly, are we looking at here? Alien spacecraft dropping by for a visit with the ISS? Reflections from ISS windows? Meteors? Or various types of orbiting or fast moving spacecraft-generated debris?

On Christmas Day, YouTube poster Streetcap1 recorded video of a silvery object, moving slowly near the curvature of Earth. At :46 into the following video, the object can be seen in faraway perspective. (link)

Check out this video.

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