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When I had to take a world religon class I multiplied the two independent probabilities for earth planets(number of known earth-ish exoplanets currently seen divded by total planets) and the probablility that a living life form has abstract cognitive abilities (humans are the only known living thing with this talent) and the probablility came out to .00000000000000000000002 chance that you could be a living organism on an earth like planet with the ability to do abstract thinking. All things considering Einsteins theory of spacial relativity and breaking the speed of light I'd say it's highly unlikely that there's aliens perusing around our solarsystem. Not saying it's impossible, but when I'm doing the math here it just seems a little ridiculous.
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