If astronomers can not see the end of the universe, how do they know it is still expanding?
What astronomers discuss is observable or our universe. It is a good convention not to prefix the definite article
A MON AVIS: The Holistic Whole of Universe is yet to be realized, For that matter, the Holistic Whole of the synonyms Nature and God are yet to be realized.
Saying that we do not see the end is truth.