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It's a Richter scale for E.T. research.
Couldn't life breathe methane and eat radiation?
You'd better bring binoculars.
What if we really are the only ones?
Did life on Earth start on another planet?
Liquid water isn't enough.
Should we be looking for one?
Are you spooked?
Why else would we not have encountered them by now?
Goldilocks, eat your heart out.