Because “Nature abhors a vacuum”. This is an old Latin proverb that can be first attributed to François Rabelais (c. 1494-1553) . Our minds can’t stand unanswered questions. So we populate the emptiness with answers like “Exterrestrials!”. Like the old maps of the world – men couldn’t leave the unknown parts empty and added “Here there be monsters!” or actually drew a few.
What has this got to do with biology? I could wave my hands and say of course behavior is driven by biology. Said and done. Moving on, I must confess, there is no direct link. I was happily reading science news online and came across the headline:
Of course I was sucked in. I always am. I find it fascinating that the first explanation is always aliens. Even when there is clearly an obvious, logical explanation. There was in this case as well, but you can read the article for yourself if you’re interested.
I just don’t get it.