The main difference between the universe and the world lies in their scope and definition. World: The term "world" typically refers to the planet Earth and everything that exists on it, including all living beings, the natural environment, and human-made structures. It is often used to describe our planet and its life, as well as a specific sphere of activity or experience.
Universe: The universe, on the other hand, refers to all matter, energy, and space that exists, including all galaxies, stars, planets, and other celestial bodies. It encompasses everything in space and time, including the Earth, and is infinite in scope. In summary, the world is a part of the universe, with the latter being the larger and more encompassing concept. The world is primarily focused on our planet and its life, while the universe includes all that exists in space and time.