The current scientific understanding suggests that the universe is both vast and potentially infinite in extent. If you were to travel in a straight line in any direction, you would not reach an "end" of the universe as far as our current knowledge suggests.
According to the prevailing cosmological models, the universe appears to be expanding, meaning that galaxies and other cosmic structures are moving away from each other. However, the expansion is occurring on a large scale, with galaxies moving away from each other due to the overall expansion of space, rather than through motion within space itself.
On very large scales, the geometry of the universe is still a topic of study and debate among cosmologists. There are several possible geometries that could describe the overall shape of the universe, such as flat, open, or closed. In a flat or open universe, the expansion would continue indefinitely, and there would be no boundary or edge to reach. In a closed universe, the expansion would eventually slow down and reverse, leading to a "Big Crunch" scenario where the universe contracts back in on itself. However, current observational evidence favors a flat or open universe.
It's important to note that the nature of the universe's ultimate extent is still an active area of research and investigation. Scientists continue to gather data and refine their understanding of cosmology, so our understanding may evolve over time as new evidence becomes available.
In summary, based on current scientific knowledge, it is unlikely that you would encounter an end or boundary to the universe if you were to travel in one direction. The universe appears to be vast and potentially infinite, with its extent continuing beyond our observational horizon.