Is the universe infinite?
Because we cannot observe space beyond the edge of the observable universe, it is unknown whether the size of the Universe in its totality is finite or infinite.
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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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