present tense
when we are describing events that happen in works of literature we should describe it in the present tense because literature is all about presents works although there a little of old works. literature is all about life characterization of humans because it deals with our emotions, feelings. it deals with prose, drama, and poetry.
Explanation:
Your Question is not much clear friend..
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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.