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Before the star that became sn 1987a exploded, it evolved from a red supergiant to a blue supergiant while remaining at the same luminosity. as a red supergiant, its surface temperature would have been approximately 4000 k, while as a blue supergiant, its surface temperature was 16,000 k. how much did the radius change as it evolved from a red to a blue supergiant?
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Before the star that became sn 1987a exploded, it evolved from a red supergiant to a blue supergiant...
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