William Kenneth Hartmann
(1939-)
American astronomer
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William Kenneth Hartmann (born June 6, 1939) is a noted planetary scientist, artist, author, and writer. He was the first to convince the scientific mainstream that the Earth had once been hit by a planet sized body (Theia), creating both the Moon and the Earth's 23.5° tilt.
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6 June 1939 (age 86) New Kensington, Pennsylvania, U.S.
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| Zodiac | Gemini |
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