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Universe includes living things, planets, stars, galaxies, dust clouds, light, and even time. Before the birth of the Universe, time, space and matter did not exist. The Universe contains billions of galaxies, each containing millions or billions of stars. The space between the stars and galaxies is largely empty.

Hydrogen is the most abundant element in the Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8. All others are substantially less common.

"the whole world, cosmos," from Old French univers (12c.), from Latin universum "the universe," noun use of neuter of adj. universus "all together," literally "turned into one," from unus "one" (see one) + versus, past participle of vertere "to turn".