An official website of the United States government
Here's how you know
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.
The Astronomy and Astrophysics Advisory Committee advises the U.S. National Science Foundation, the National Aeronautics and Space Administration and the U.S. Department of Energy on issues of mutual interest and concern.