Surveying former glaciers
As Mars Express swooped over the surface of Mars its High Resolution Stereo Camera (HRSC) found some intriguing traits in Mars' tropical and mid-latitude regions. Within these regions were features relating to recent and recurring glacial activity, known as debris aprons.
In a region called Promethei Terra, on the eastern rim of the Hellas Basin, there was an unusual ‘hourglass‘-shaped feature which caught the attention of many. Research found that it’s an impact crater filled to the brim with ice and an assortment of small rocks. The lack of impact craters on the deposits indicates it’s relatively young – another significant piece of evidence in determining the previous climate history of Mars.
Glaciers likely shaped the mid-latitude surface of Mars just a few million years ago