《星球旅行的奥秘》(以下简称《奥秘》)(劳伦斯·克罗斯著,董成茂译,中国对外翻译出版公司2001年版)和《时间旅行》(约翰内斯·冯·布特拉尔著,汪阳译,湖南科学技术出版社2001年版),分别出自美国著名物理学及天文学教授和德国著名畅销书作家之手,是探讨垦际之旅是否可能的科普类学术著作。值得一提的是,前一本书的写作成因要追溯到三十年前美国电视台播出的一部名 The Mystery of Planetary Travel (hereinafter referred to as the Mystery) (by Lawrence Cross, Dong Chengmao, China Foreign Translation & Publishing Company, 2001) and Time Travel (Johannes von Butler, Wang Yang translation, Hunan Science and Technology Press 2001Edition), respectively, from the United States well-known professor of physics and astronomy and the famous German best-selling author’s hand is to explore Kenji Journey is possible science class academic works. It is worth mentioning that the reason for the writing of the previous book dates back to aired on American television thirty years ago