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The diameter of the observable universe is approximately 93 billion light-years. This measurement encompasses all the regions of space from which light has had time to reach us since the Big Bang, approximately 13.8 billion years ago. Due to the expansion of the universe, the observable universe is larger than just the distance light has traveled in that time, as space itself has been stretching. Consequently, while we can see light that has traveled for billions of years, the actual extent of the observable universe is much greater.

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1mo ago

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How many light years is the diameter of the known universe?

The OBSERVABLE Universe has a diameter of about 93 billion light-years. "Observable" means that the light of anything beyond that hasn't had time to reach us, since the time of the Big Bang.


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The observable Universe has a diameter estimated at 93 billion light-years.


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To estimate how many Planck lengths fit in the observable universe, we first note that the diameter of the observable universe is about 93 billion light-years, or approximately (8.8 \times 10^{26}) meters. The Planck length is approximately (1.6 \times 10^{-35}) meters. Dividing the diameter of the observable universe by the Planck length gives roughly (5.5 \times 10^{61}) Planck lengths across the observable universe, indicating an extraordinarily vast number of these tiny units can fit within it.


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