November 11
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1572 – Tycho Brahe observes the supernova "SN 1572", often called "Tycho's supernova".
1875 – Astronomer Vesto Melvin Slipher is born. His observations of the radial velocities of spiral galaxies provided the first evidence supporting the expanding-universe theory.
1952 – Actor Max Grodenchik (Rom) is born.
1966 – NASA launches spaceship Gemini 12, which successfully demonstrates that astronauts can work outside of the spacecraft.