briefly define universe and galaxy
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universe and galaxy
Explanation:
The universe refers to the totality of all that exists, the cosmos. The universe is flat and is composed of 4.6% atoms, 24% cold dark matter, and 71.4% dark energy. A galaxy is a large collection of stars, gas, and dust kept together by gravity. Galaxies come in all sorts of different shapes and sizes.
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Universe is all of space and time and their contents, including planets, stars, galaxies and all other forms of matter and energy while galaxy is a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
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