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The surface area of a sphere (any sphere) is 4 π steradians. This means that the...

The surface area of a sphere (any sphere) is 4 π steradians. This means that the celestial sphere covers 41953 square degrees (3602/π) of the sky. The HUDF image is a square of side length 2.4 arc-minutes, and 10,000 galaxies are estimated within the image. Assuming the cosmological principle, how many billions of galaxies are there in the known universe?

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