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How does this size compare with the size of the sun

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A quasar changes brightness in one week, so it must be smaller than the distance light travels in a week. How big is this in kilometers? How does this size compare with the size of the Sun? Solar System? Milky Way?

(Solar System: 1.5 x 1010 km, Distance to nearest star: 4 x 1013 km, Milky Way diameter: 1018 km)

Reference no: EM131857425

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