A satellite that orbits the Earth at a relatively low altitude - no greater than 2000 kilometers. All polar-orbiting satellites are in LEO.
Low Earth Orbit Satellite (LEO)
An official website of the United States governmentOfficial websites use .gov 
A .gov website belongs to an official government organization in the United States.
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS 
A lock 🔒 or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites..
A lock 🔒 or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites..