This is an excellent capture from video being streamed by NASA from the International Space Station. The Gather.com article says that it couldn’t possibly be a satellite, but, in fact, it could be. It could also be a manmade device of some kind, perhaps classified. It could also be an alien spacecraft, of course. There is no question about it being a hoax. It is genuine video.

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http://www.gather.com/viewArticle.action?articleId=281474981505265