Before revision: The Student Nitric Oxide Explorer (SNOE ("snowy"), also known as Explorer 72 and STEDI 1 ), was a small scientific satellite which studied the concentration of nitric oxide in the thermosphere.
After revision: The Student Nitric Oxide Explorer (SNOE ("snowy"), also known as Explorer 72 , STEDI-1 and UNEX-1NASA ), was a small scientific satellite which studied the concentration of nitric oxide in the thermosphere.