Question

what is universe ??????​

Answer 1

1the universeAll existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago.

‘Among the many mysteries in the universe is the dark matter in galaxies and clusters.’

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Answer 2

Answer:

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The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. Wikipedia

Mass (ordinary matter): At least 1053 kg

Main contents: Ordinary (baryonic) matter (4.9%); Dark matter (26.8%); Dark energy (68.3%)

Age (within Lambda-CDM model): 13.799 ± 0.021 billion years

Diameter: Unknown. Diameter of the observable universe: 8.8×1026 m (28.5 Gpc or 93 Gly)