宇宙搭便车假说：地外文明使用自由浮动行星进行星际殖民
The Cosmic Hitchhikers Hypothesis: Extraterrestrial Civilizations Using Free-Floating Planets for Interstellar Colonization
摘要：
我提出宇宙搭车客假说如下。先进的地外文明可能会使用自由浮动的行星作为星际交通工具进行太空探索和星际殖民。他们的生物物种、后生物物种和技术的大群体或人口可能成为宇宙搭便车者，当他们乘坐自由浮动的行星到达、探索和殖民行星系统时。为了得到一次星际旅行，宇宙搭车旅行者可能会旅行到自由浮动的行星，这些行星经过他们的家园。否则，他们可能会使用天文工程来引导自由漂浮的行星朝向它们的母行星系统。宇宙漫游者也可能乘坐其行星系统外部区域的原生物体，这些物体在渐近巨星分支演化期间被天文工程或其恒星抛出时成为自由浮动的行星。在星际旅行中，宇宙搭便车者可能会应用天文工程来引导他们的自由漂浮的行星朝向他们选择的行星系统。虽然乘坐自由浮动的行星可能不会节省旅行时间，但它避免了星际飞船运输大量人口的技术挑战。每个宇宙搭便车的文明可能殖民几个行星系统。它的殖民地可能会发展成自治文明，改变银河系的文明数量。在过去的40亿年里，宇宙漫游者或他们的神器骑着自由浮动的行星可能已经通过了太阳系。因此，它们的人工制品可能存在于太阳系或我们的恒星附近。SETI和SETA应该包括寻找宇宙漫游者和他们的文物。保留字：SETI，SETA，自由浮动的行星，地外文明，星际旅行，星际殖民，人工制品，宇宙搭车客
英文摘要：
I propose the Cosmic Hitchhikers hypothesis as follows. Advanced extraterrestrial civilizations may use free-floating planets as interstellar transportation for space exploration and interstellar colonization. Large groups or populations of their biological species, post-biological species, and technologies may become Cosmic Hitchhikers when they ride free-floating planets to reach, explore and colonize planetary systems. To get an interstellar ride, Cosmic Hitchhikers may travel to free-floating planets passing close by their home worlds. Otherwise, they may use astronomical engineering to steer free-floating planets toward their home planetary systems. Cosmic Hitchhikers may also ride objects native to the outer regions of their planetary systems, which become free-floating planets when ejected by astronomical engineering or by their stars during the asymptotic giant branch evolution. During interstellar travel, Cosmic Hitchhikers may apply astronomical engineering to steer their free-floating planets toward the planetary systems of their choice. Whereas riding free-floating planets may not save travel time, it avoids the technical challenges of interstellar spacecraft transporting large populations. Each civilization of Cosmic Hitchhikers may colonize several planetary systems. Its colonies may grow into autonomous civilizations, changing the number of civilizations in the Galaxy. Over the last 4 billion years, Cosmic Hitchhikers or their artifacts riding free-floating planets might have passed by the Solar System. Therefore, their artifacts might exist in the Solar System or in our stellar neighborhood. SETI and SETA should include the search for Cosmic Hitchhikers and their artifacts. Keywords: SETI, SETA, free-floating planet, extraterrestrial civilization, interstellar travel, interstellar colonization, artifact, Cosmic Hitchhikers
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