Quote:
Originally Posted by Snuffleupagus
Not saying you yourself think that was alien but all these assumed alien UFO's with lights kind of bother me, if somehow aliens are smart enough to figure out how to travel billions of miles would they be stupid enough to leave the lights on? or why would they need lights at all?
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Maybe they aren't lights, but instead a signature left behind by their propulsion system? We drive vehicles that have an exhaust emission that can't be seen, except when environmental conditions are such that it makes the invisible gas, visible. If these devices rely on electromagnetism or plasma fields to act as their propulsion system, that the residual effect would be a radiation field that under certain conditions becomes visible in the spectrum where our eyes can detect that radiation.