UFO expert has claimed to have seen a massive 200m alien floating past the International Space Station (ISS) on the craft's live stream.Scott Waring, who runs the site UFOsightingsdaily.com, said he copped the mysterious mass while watching the station like he normally does.What happened next, however, was a first as Mr Waring said he has "never seen this in my 15 years of watching the space station cam!" The UFO fanatic wrote on his site: "Now check out this...just when I thought I've seen everything, a giant green alien figure floats past the International Space Station live cam. Yes, you heard me right.