Chernobyl disaster / Shapley-Curtis debate - April 26

On this day in 1986, a chemical explosion in a nuclear reactor at the Chernobyl nuclear power plant in Soviet Ukraine triggered one of the worst nuclear disasters ever. / On this day in 1920, astronomers Harlow Shapley and Heber Curtis presented their opposing points about the scale of the universe in an event sometimes called “The Great Debate.”

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