The Mars Phoenix Lander may have taken pictures of a surface of ice instead of just a dinky little rock that might be ice. This is a bit more impressive.
![Possible ice surface on Mars; image from NASA](http://www.nasa.gov/images/content/234082main_under-427.jpg)
The Mars Phoenix Lander may have taken pictures of a surface of ice instead of just a dinky little rock that might be ice. This is a bit more impressive.