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The exosphere is the region of the atmosphere above an altitude of 285 miles.[1] The exosphere is the upper most layer of the earth's atmosphere; the only layer where atmospheric gases can escape into outer space.[2]


  1. Wile, Dr. Jay L. Exploring Creation With Physical Science. Apologia Educational Ministries, Inc. 1999, 2000
  2. http://www.weather.gov/glossary/index.php?letter=e