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 image is from the Martian southern polar region. CO2 ice shown here is about 10 feet thick, and the semi-circular depressions are about 200 ft across.
Public Domain.
Image credit: NASA/JPL-Caltech/Univ. of Arizona
