Posted 26 July 2012 - 02:46 PM
Seeing a clear picture of a mile wide object, in focus, would take away all doubts. Providing it stood up to detection of hoaxes, after all Hollywood makes great looking alien spacecraft.
I tend to think that people are seeing something in the sky, the mass sightings are tough to ignore. I lean more towards unidentified aircraft, objects, or unique atmospheric conditions. Alien spacecraft traveling unimaginable distances across the galaxy would be highly unlikely to use "running lights" while in earths atmosphere, especially if they are here maliciously.