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universe

totality consisting of space, time, matter and energy

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About universe

The universe comprises all of existence: all forms of matter and energy in space and time, and the structures they form, from subatomic particles to entire galactic filaments. Since the early 20th century, the field of cosmology has established that the universe has been expanding for 13.8 billion years, starting from a dense fireball in an event called the Big Bang. The observable portion of the universe is approximately 93 billion light-years in diameter at present. The total size of the universe is not known.

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Facts from Wikidata (CC0). Image by NASA, ESA, H. Teplitz and M. Rafelski (IPAC/Caltech), A. Koekemoer (STScI), R. Windhorst (Arizona State University), and Z. Levay (STScI) via Wikimedia Commons (Public domain).

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