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There are an estimated 10^22 to 10^24 stars, or in the many sextillions range. So really, don't worry, we wouldn't have the capability to taint any significant amount of the universe even if that was our sole purpose.


Well, exponential growth (and Von Neuman Probes!) can get fun quite quickly. ;-)


Inflation puts to rest any ideas about that. Most of the observable universe is outside our future light-cone.




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