“比空气还轻”飞行协会致力于研制一种比空气还轻的气体作为飞船动力,但在纳粹德国的统治下,这一切只能秘密进行。几十年后,成员之一格拉第的一本笔记被后人发现,上面记载着他们令人震惊的登月旅行…… “Lighter than air ” Flight Association is committed to developing a gas lighter than the air as a spacecraft power, but under the rule of Nazi Germany, all this can only be conducted in secret. Decades later, a note by one of Grady’s members was discovered by his descendants, stating their astounding lunar trip ...