### Question
How does NATIONAL SPACE PROGRAM define upper atmosphere?


### Answer
Under *42 U.S.C. § 2482*, **upper atmosphere** is defined as:

> that portion of the Earth's sensible atmosphere above the troposphere

#### Citation:
  - *42 U.S.C. § 2482*
  - Heading: **CHAPTER 26-NATIONAL SPACE PROGRAM > SUBCHAPTER III-UPPER ATMOSPHERE RESEARCH**

