The first true space travel stories weren't written until after 1610. Before then, no one knew for sure that there even were other worlds than this one. But Galileo's great discoveries changed all that. People began to wonder what these other worlds might be like and authors lost no time in getting their interplanetary stories into print. The earliest authors were at a loss regarding exactly how to get their heroes to the Moon and other worlds and had to resort to magic and other unlikely devices. The invention of the balloon was a godsend. For the first time a man-made device enabled humans to leave the surface of the Earth---and there was a renewed surge of space travel stories. Most of these authors merely used the Moon and planets as a convenient backdrop for social satire, but others took some pains to get the science correct---or at least as correct as knowledge of the time permitted. The books in this series run the gamut from from balloons to antigravity, from what may be the first interplanetary story ever written to the first suggestion ever for a passenger-carrying rocket. 

Many of these books and stories have not been available in any form for decades. They all contain historical essays and other material written specially for this series by Ron Miller.