November 11

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1572 – Tycho Brahe observes the supernova "SN 1572", often called "Tycho's supernova".
1875Astronomer 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.
1966NASA launches spaceship Gemini 12, which successfully demonstrates that astronauts can work outside of the spacecraft.