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The Hubble Space Telescope (HST) has excellent resolving power because there is no atmospheric distortion of the light. Its 2.4-m-diameter primary mirror can collect light from distant galaxies that formed early in the history of the universe. How far apart can two galaxies be from each other if they are 12 billion light-years away from Earth and are barely resolved by the Hubble Telescope using visible light with a wavelength of 503 nm?

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