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.
NNSA works with partners to detect and mitigate impact threats from potentially hazardous near-Earth objects.
National Nuclear Security Administration
November 14, 2017
minute read time
