William Kenneth Hartmann

American astronomer · United States · On the map · Scientists · Born 1939 · age 87

William Kenneth Hartmann is an American 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.

William Kenneth Hartmann is read about 9.5 times a day, in 12 languages.

A typical day, 30 days to 21 June 2026

The middle day of the days counted, so one week of news cannot move it. The line under it is the last 60 days, one point a day.

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A life in dates

2013Eugene Shoemaker Distinguished Scientist MedalAward2010Barringer MedalAwardFellow of the American Association for the Advancement of ScienceAward2004G. K. Gilbert AwardAward1998Carl Sagan Medal for Excellence in Public Communication in Planetary ScienceAward1939Born6 June 1939

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