In April 1986, the world's worst nuclear power disaster occurred at Chernobyl in the former USSR. An explosion released about 1,000 kilograms of radioactive cesium-137 (137Cs) into the atmosphere. If the half-life of 137Cs is 30.17 years, how much will remain in the atmosphere in 130 years? (Round your answer to the nearest kilogram.)  kg

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