What does Mass want to tell us by writing "At the edge of darkness"?

Mass 写《在黑暗的边缘》想告诉我们什么？

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At the edge of darkness, after about eight hours, I turned around and saw the Earth from our altitude at Hubble, 568 kilometers up.

在黑暗的边缘，大约8个小时后，我转过身来，从哈勃望远镜上看到了568公里高处的地球。

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Edge of Darkness, based on the 1985 Brit TV drama about a cop searching for his daughter's killers, bears a resemblance to last year's Liam Neeson hit Taken.

《黑暗边缘》改编自一部1985年的英国电视剧，讲述的是一名警察寻找杀害其女儿凶手的故事，这部电影被指与去年利亚姆·尼森的卖座电影《飓风营救》情节雷同。

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She was at the edge of darkness or the edge of light, depending upon which way you were going.

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