I hate the "we can't explain it in any other way, so it MUST be aliens!!11"-argument. That would imply that we humans know every thing in nature, but do we?
Btw, a fun story I might add here:
Some 15 years ago, our neighbor at the time got hold of some lights used in WW2, and he and my dad decided to have some fun with them by lighting up the hills of the valley. They added a few plates of different colours too, so they could light up the forest in different colours. Anyway, the day after that, UFO's had been spotted in the night sky of Bergen, which is on the other side of Norway(the western one, I live in the east). Lights had appeared, and in different colours... Guess who was responsible for that?
The TV company contacted a university, and got a professor on the case, and he found out that due to the particular nature of the sky on that day, the light was able to travel over the mountains to Bergen. Kind of like you can sometimes catch radio waves from places far away on your walkie-talkie, if the conditions are just right.
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