Upgren, Arthur. Many Skies: Alternative Histories of the Sun, Moon, Planets, and Stars
Summary: Collection of speculations on if the Earth and/or the Solar System formed under different circumstances.
Comments: For comparison, see Neil F. Comins's What If the Moon Didn't Exist?.
Published: Rutgers University 2005 (0813535123BUY).
Uchronia is copyright © 1991-2018 Robert B. Schmunk