Mars faced an ice age 400,000 years ago, and it's still recovering
 

We've known for a while now that Mars has water frozen in ice. And analyzing that water has been a key goal to understanding how the planet has changed over time, especially if its presence meant it once held life. Today, a newly published study conc...

http://www.engadget.com/2016/05/26/m...till-recoveri/