The concept of "the universe" refers to all of space, time, matter, and energy that exist. It encompasses everything we can observe, from galaxies and stars to planets and living beings. As far as our current understanding goes, the universe is considered to be all-encompassing and does not have anything larger than it.
However, it is important to note that the observable universe—the portion of the universe that we can see—is limited by the distance that light has had time to travel since the Big Bang. Due to the expansion of space, there are regions of the universe that are so far away that light from those regions has not reached us yet. This means there may be more to the universe beyond what we can currently observe.
Additionally, there are cosmological theories, such as the idea of a multiverse, which suggest the possibility of multiple universes or larger structures beyond our observable universe. These theories are speculative and currently lack empirical evidence, but they are proposed to explain certain observations and theoretical considerations.
In summary, according to our current understanding, the universe encompasses everything. However, there are still unknowns and areas of active scientific exploration that may provide further insights into the nature and potential extent of the universe.