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Answer:
In other words, it is so old that it is difficult to imagine.
Explanation:
In this case, the simplest answer is the correct one. It's not about math or science; it's just what it is; the history of the universe is very hard to imagine because is humans haven't been in it for very long.
The basic rhythmic structure of a poem is called its Meter
A Fahrenheit has 451 novel
I would think it's "rejection of enlightenment ideas"