December 20
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1900 – Michel Giacobini in France discovers a comet, which was rediscovered by Ernst Zinner in 1913, and since named the "Giacobini-Zinner comet".
1970 – Actor Nicole deBoer (Counselor Ezri Dax) is born.
2019 – The United States Space Force becomes the first new branch of the United States Armed Forces since 1947.
