Episode 23 - Esker Questions (feat. Frances Butcher)
New episode is out this morning, Martians!

On Earth, geologists are pretty familiar with the concept of an esker, a  snake-like ridge formation left behind by a receding glacier. Across  our planet they can be found in areas where glaciers once dominated the  landscape. The same is true on Mars, but eskers also require a time when  glaciers could melt. Frances Butcher, a PhD student from the  Open University, talks with Jake about these special kinds of Martian  eskers that indicate a warmer, wetter environment than we once thought.