We have continents and we have seas. We have a thin layer of gas to separate us from the dark vacuum above. So does Titan. We have people, 6 billion and more, each enveloped in his or her own unique importance. Titan has none.
KeywordsThin Layer Separate Image Relative Brightness Unique Importance Unknown Surface
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
© Springer Science+Business Media, LLC 2008