Photograph of the United States at Night
Detailed Description
The importance of electric power is demonstrated by this view from space of lights across the continental United States at night. Credit: NASA
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.
