Comins, Neil F. <br/><br/>
What if the earth had two moons? :  and nine other thought-provoking speculations on the solar system / 
by Neil F. Comins. 
 - 1st ed. 
 - New York :  St. Martin's Press,  c2010. 
 - 288p. 
<br/><br/> Includes bibliographical references. 
<br/><br/><label>ISBN: </label>978-0-312-59892-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth--Miscellanea<br/>Solar system--Miscellanea.