by Terence Dickinson

Published in Astronomy Magazine
December 1974 Issue

from GravityWarpDrive Website

Recovered through WayBackMachine Website

 

 

 

With related commentary by:
Jeffrey L. Kretsch, Carl Sagan, Steven Soter, Robert Sheaffer, Marjorie Fish, David Saunders,

Michael Peck

 

 

Table of Contents

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