The Universe constitutes all of space and time, encompassing all physical matter and energy. Its observed structure includes vast groupings of stars and galaxies, which are themselves composed of interstellar gas and plasma. Modern astrophysical understanding indicates that the Universe is not static but is in an ongoing state of accelerated expansion. The prevailing cosmological model posits that the composition of this cosmic expanse is dominated not only by ordinary matter, but also by mysterious components such as dark matter and dark energy, which govern the overall dynamics and evolution of spacetime. The ultimate boundary and physical laws governing this totality remain central subjects of study within theoretical and experimental physics.