Astronomers have counted more than 200 billion stars in the Milky Way galaxy and more than 2 trillion galaxies in the visible universe. The number of planets is more difficult to estimate, but it’s possible that it exceeds 10 to the 20th power (a one followed by 20 zeros). So, if even one in a trillion planets can support life, then the known universe contains millions of planets that could have a civilization similar to our own. And it seems certain that even more stars and planets lie beyond what’s visible to us.
If the thought of a universe with millions of alien worlds isn’t enough to make you feel insignificant, then consider this: Many cosmologists suggest that ours is not the only ‘big bang’ and that many universes may exist in an infinite array that they call the multiverse. However, they also say that it’s not possible to observe or interact with these other universes, so they may belong more in the realm of faith than of science.
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