Author
William K. Hartmann
2 standalones · 2 works in the catalog
b. 1939 · New Kensington, Pennsylvania, USA
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.
Source · Wikipedia CC BY-SA 4.0
