In the long list of modern fears, bloodthirsty aliens may not rank near the top. We have more immediate worries, from terrorism and bioengineered (or not) global epidemics to nuclear holocaust and natural disasters.
However, the notion that other intelligences exist out there in the universe is pervasive in popular culture. Mirrors to our own history, in particular colonial exploitations, aliens are often portrayed as evil invaders bent on coming here to wreak havoc.
How realistic are these scenarios, given what we know now about astronomy and the possibility of life in other worlds?
Source: NPR
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