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远道而来的殖民者(第1页)

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远道而来的殖民者

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为了理解上述结论的重要性,读者必须了解我们常用的所谓“太空”

的概念。

太空广袤无垠,无远弗届,以至于想要感知太空之大,只能通过类比来实现,例如使用微缩模型。

举例:

如果地球是一根缝衣针的针尖,那么太阳就相当于距离针尖50英尺的一颗葡萄。

在以上模型中,太阳系的“外部标记”

——冥王星的轨道——距离太阳是日地距离的40倍,所以冥王星也可以用针尖来表示(但其大小只有地球的四分之一!

),位于半英里开外的地方。

下面让我们加入时间的元素。

在“真实宇宙”

中,光的速度是每秒30万公里,即使速度如此之快,从太阳照到地球的光也需要8分钟才能到达!

抵达60亿公里之外的冥王星的轨道则需要五个多小时!

太阳系以外最近的恒星是半人马座阿尔法星,它与我们的距离几乎是日地距离的100万倍。

在上面的模型中,可以将其比作在离那颗代表太阳的“葡萄”

8000英里的地方旋转的另一颗葡萄——太阳和半人马座阿尔法星就像漂浮在半空中、相距8000英里的两颗葡萄。

太阳与其他行星的距离更是令人咋舌:如果上述模型来表示以太阳为中心、20光年为半径范围内的所有恒星的话,可以将它们比作漂浮在相当于60个地球那么大的空间中的一颗颗葡萄,其间距至少有地球的直径那么远!

人类若想到邻近的星际旅行,必须运用最先进的技术解决一路上可能遇到的各种问题,例如时间。

而以目前的技术,人类的星际航行速度远达不到“光速”

,而且,即使采用了核聚变或反物质等先进的动力系统,也只能达到光速的十分之一,以此速度,至少需要花上半个世纪才能抵达半人马座阿尔法星!

无怪乎有人将星系间的遥远距离比喻为“上帝设置的隔离措施”

所以,我们很难设想,会有太阳系之外的智慧生物穿越万亿英里的距离拜访我们的星系,除非亲眼目睹相关的证据。

读者们已经了解到星际航行的种种障碍,现在我们来看看“火星建筑假说”

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