How huge is the universe?
While the spatial size of the entire Universe is unknown, it is possible to measure the size of the observable universe, which is currently estimated to be 93 billion light-years in diameter.
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Is the universe flat? In a universe with zero curvature, the local geometry is flat. The most obvious global structure is that of E...
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How old is our world? The age of the Earth is estimated to be 4.54 ± 0.05 billion years (4.54 × 10 9 years ± 1%). This age may rep...
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