The ultimate fate of our universe is still a topic of scientific investigation and speculation. While our current understanding suggests that the universe will undergo significant changes over extremely long timescales, it is not yet possible to definitively say what will happen in trillions of years.
One possibility is the concept of heat death or the "Big Freeze." This theory suggests that as the universe continues to expand, the energy available for new stars and galaxies to form will diminish. Eventually, existing stars will burn out, leaving only remnants like black holes. Over time, the universe would become a cold, sparse, and lifeless place.
Another possibility is the "Big Rip" hypothesis. In this scenario, the expansion of the universe accelerates, eventually tearing apart all matter, including atoms themselves. This would result in the dissolution of all structures and objects in the universe.
However, it's important to note that these are current theories and hypotheses, and our understanding of the universe is continually evolving. New discoveries and observations may provide us with additional insights and potentially new theories about the fate of the universe.
Regarding the concept of space itself, it is commonly believed that space will continue to exist even if the universe undergoes significant changes. Space, as we understand it, is a fundamental part of our cosmological framework. Even if all matter and energy were to dissipate or undergo transformations, space would still exist in some form.
It's worth mentioning that these speculations are based on our current understanding of physics and cosmology, which could evolve as new discoveries are made.