What is the size of Observable Universe ?
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The size of Observable Universe is said to be 46.5 billion light-years. The size could actually vary because only light from 46.5 billion light- years has reached us till now.
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The observable universe is a spherical region of the universe comprising all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time, because electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion. There are at least 2 trillion galaxies in the observable universe.
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