Footage has emerged of what leading UFO researchers believe to be an alien "mothership" - the mammoth craft was spotted on NASA's live feed of the space region adjacent to the International Space Station (ISS). Fraternal alien fanatics Blake and Brett Cousins - renowned in the ufologist community for their YouTube account thirdphaseofmoon - published the baffling footage July 17. In the clip, a hazy object swims into view in the background of the ISS - while seemingly a mere line of burning orange orbs initially, quickly the shape of what appears to be a spacefaring vessel gains contour and colour. However, almost as soon as the unexplained entity gains definition, it melts back into the infinite darkness of space. The clip itself, the Cousins duo said, is sped up by 900 percent - the actual event lasted over nine minutes. The pair enlisted the expertise of a UFO aficionado to shed some light on what the apparent craft - which they claimed was "tracking" the station - might actually