What is the word for being disappointed in not knowing mankind's fate?

A long time ago I read about a word that means something like "The fear or disappointment that you will never know the ultimate fate of mankind and the universe and how it will all play out."

It is a very rarely used word, and I was interested to know it exists, but I have forgotten. Does anyone know what it is?

Solution 1:

Ellipsism - the feeling of sadness that you will not know how history plays out.

It should be noted that this is a made up word, from a project where they aimed to name words for emotions that currently have no name. (Source: http://www.openculture.com/2019/04/words-invented-to-name-emotions-we-all-feel-but-dont-yet-have-a-name-for.html). The project is called "Dictionary of Obscure Sorrows".