Schrödinger is a very large impact crater, 320 kilometers (198.5 miles) in diameter, that scientists call a “basin.” In addition to a complete outer rim, it contains a ring of mountain peaks inside the basin. Schrödinger is famous for a small, dark volcanic vent (the keyhole-shaped crater marked by a red arrow) found on the basin floor. Mini-SAR acquired several image strips of the basin floor, including coverage of the dark material surrounding this vent. Those dark deposits are also “radar dark,” indicating that this material is very fine-grained. These properties – first revealed by Mini-SAR – are expected of dark, volcanic ash, magma erupted through explosive, fire-fountain eruptions on the moon many billions of years ago. This image shows that in addition to revealing the nature of deposits at the poles of the moon, Mini-SAR data will be useful to unravel the moon’s detailed geological history.