地球是有生命的这一想法处于科学可信度的边缘，但并未超出其范围。

The other thing about modern society and why it causes this anxiety, is that we have nothing at its center that is non-human. We are the first society to be living in a world where we don't worship anything other than ourselves. We think very highly of ourselves, and so we should; we've put people on the Moon, done all sorts of extraordinary things. And so we tend to worship ourselves.

随着距离的增加，我们的知识逐渐消失，而且消失得很快。最终，我们到达了模糊的边界——我们望远镜的极限。