The constellation Orion is approximately 800 lightyears from the Earth. (One light-year is the distance traveled by

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The constellation Orion is approximately 800 lightyears from the Earth. (One light-year is the distance traveled by light in a vacuum in one year.) Assume one of the stars in this constellation has a planet orbiting at the same distance as Saturn orbits the Sun. How large should the aperture of a telescope be so that it can resolve the star from its planet using light with λ = 450 nm?

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