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''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. 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 ==References== *Neil F. Comins: ''What If the Moon Didn’t Exist''. HarperCollins, 1993 ISBN 0-06-016864-1 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「What If the Moon Didn't Exist」の詳細全文を読む スポンサード リンク
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