What If the Moon Didn't Exist

What if the Moon Didn't Exist is a collection of speculative articles about different versions of Earth, published in book form in 1993. They were originally published in Astronomy magazine.

Contents
The individual scenarios are:


 * Solon – Earth without a Moon
 * Lunholm – Moon closer to Earth
 * Petiel – Earth with less mass
 * Urania – Earth's axis tilted like that of Uranus
 * Granstar – More massive Sun
 * Antar – Effects if a supernova exploded near Earth
 * Cerberon – Star passing through the Solar System
 * Diablo – Black hole passing through the Earth
 * Seeing the world via infrared
 * Effects of ozone layer depletion

Reception
Reviews in Publishers Weekly and Kirkus said that the first several stories were interesting, but noted that the conceit grew repetitive.