"In the vastness of one of the world’s oldest deserts lies a relatively recent geologic feature: the Roter Kamm crater (“red comb” or “red crest/ridge” in German). An astronaut onboard the International Space Station photographed the crater while orbiting over the Namib Desert. It is approximately...
Source: nasa.gov
Frozen Pluto has wind-blown dunes made of methane sand. The same complex forces that make the patterns in our world that we so admire also work in alien worlds but, as in Pluto, on substances that would be truly exotic here on earth.
Source: arstechnica.com