heavens vs stratosphere

heavens

noun
  • The distant sky of the sun, moon, and stars. 

intj
  • An expression of surprise, contempt, outrage, disgust, boredom, or frustration. 

stratosphere

noun
  • The region of the uppermost atmosphere where temperature increases along with the altitude due to the absorption of solar ultraviolet radiation by ozone. The stratosphere extends from the tropopause (10–15 kilometers) to approximately 50 kilometers, where it is succeeded by the mesosphere. 

How often have the words heavens and stratosphere occurred in a corpus of books? (source: Google Ngram Viewer )