Carl Keenan Seyfert
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Carl Keenan Seyfert (February 11, 1911 – June 13, 1960) was an American astronomer. He was born in Cleveland, Ohio.
He is best known for his 1943 research paper on high-excitation line emission from the centers of some spiral galaxies, which are named Seyfert galaxies after him. Seyfert's Sextet, a group of galaxies, is also named after him.
He died in an automobile accident.