1939

1939 was the tenth and final year of the 1930s and the thirty-eighth year of the 20th century.

When ground quakes start to shake Krypton. Jor-El, Mia and Lo-Di; members of the Kryptonian Science Council, began a scientific study of Krypton's core, and they learned that internal stresses were going to cause the planet to one day explode, although they still didn't know when.

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1938

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1940