Official websites use .gov
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.
This chart shows the number of commercial and government/civil satellites launched each year since 1972.
Visit the Earth Observing Satellites webpage to learn more.
Public Domain.
