Take a close look at the surface of Mars and you might mistake the images for the dusting of a crime scene. Alas, these troughs and ridges, known as "fingerprint terrain," are actually rows of circular mounds beneath the surface of Mars.
How did they form? Good question. As usual, Caitlin Ahrens breaks down this touchy subject in today's episode.
Scratching the Surface airs Fridays at 2:04 pm. For more on the Center for Space and Planetary Science, visit spacecenter.uark.edu/