The Universe is the totality of everything that exists, has existed, and ever will exist. Similar meaning is sometimes conveyed with the words cosmos, world, reality, and nature. The Universe includes all of spacetime; the entire contents of outer space; all matter, energy, dark matter, and dark energy; all galaxies, stars, and planets; all humans and every living thing; all molecules, atoms, subatomic particles, photons, and their wave dualities; all physical constants, physical laws and fundamental interactions. The Universe can even be understood to encompass all of mathematics, all concepts and ideas, and all thoughts and emotions.
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HMS
