在宇宙中除了我们人类以外,是否还存在着其它智慧生命呢? 科学家对于这一问题的争论,使得在他们之间形成了两个阵营。其中一个争辩说,地球围绕着一颗普通的恒星在旋转,而地球也是一颗普通的行星,因此既然我们人类能在地球上生存,则智慧生命在宇宙中一定是比比皆是的了。这一推论和“地球寻常原理”的观点是并行不悖的,该原理认为地球上的生命是如此普通,以致可以作为宇宙中生命的代表。 Are there other intelligent life besides the human in the universe? Scientists controversy over this issue has led to the formation of two camps between them. One of them argues that the earth revolves around a common star, and that the Earth is also an ordinary planet. Therefore, since we humans can live on this planet, intelligent life must be everywhere in the universe. This corollary is consistent with the notion of “Earth’s Vital Principle,” which claims that life on earth is so common that it can serve as a representative of life in the universe.