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Perspective (With Respect to Time)

It's good to keep a proper perspective about how big the universe is. It is also instructive to remember just how old the universe is as well.

Carl Sagan popularized the idea of compressing the entire history of the universe since the beginning of time into a single calendar year as a way for us humans to better relate to the vast numbers involved. Here is a nice version of that calendar (each month is equivalent to a little more than 1 billion years):

You can see a more detailed example, with all of the various eras and more human-scale events, here.

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