Recently NASA attached a bunch of high-definition cameras to the outside of the International Space Station. The main result — for those of us on the sidelines of space research and commerce – has been a few days of utterly beautiful images of Earth. Inevitably, it has also been something of a treasure trove for UFO hunters. A brief search on YouTube and conspiracy theory sites reveals a bunch of different sightings of unidentified objects – some mere flashes in space, others quite hilariously huge – which they claim are aliens above the Earth. More