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is roughly 87,400 light-years in diameter, and the nearest sister galaxy to the Milky Way, the Andromeda Galaxy, is located roughly 2.5 million light-years away.

Because humans 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.

Age and expansion

Assuming that the Lambda-CDM model is correct, the measurements of the parameters using a variety

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