What Is Universe
The universe is the vast, all-encompassing system that includes everything that exists: all matter, energy, planets, stars, galaxies, and even the very space and time itself. It is the totality of all physical existence, encompassing all of space-time and its contents. Here's a brief overview of key components and concepts related to the universe: 1.Matter and Energy: The universe contains matter (such as stars, planets, and galaxies) and energy (such as light and radiation). According to the principle of mass-energy equivalence (E=mc^2), matter and energy are interchangeable. 2.Space-Time: Space and time are interconnected in a four-dimensional continuum known as space-time. This concept, developed by Einstein's theory of general relativity, describes how matter and energy in the universe shape the fabric of space-time. 3.Galaxies and Stars: The universe is filled with galaxies, which are massive systems containing stars, planetary systems, interstellar gas, and dark matter.