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27-05-2023
Geography

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A supernova remnant is now 2.65 pc in radius and is expanding at 4,100 km/s. Approximately how many years ago did the supernova occur? (Note: 1 pc = 3.1 ✕ 1013 km and 1 yr = 3.2 ✕ 107 s.) years ago

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