Before researching this, I was expecting more of a concise, to the point answer. But that is not the case, as it is impossible to predict exactly when it will happen. The best guess is many many many centuries from now, if it even happens, as in whether or not it continues to expand. One day it will be stretched so far, that it may just curl into itself, effectively killing itself.
In this post, the author is…
How do you know?
Having a questioning attitude; knowing what data are needed & developing questioning strategies to produce those data. Finding problems to solve.