Robert Wagner was checking image quality on a global map of the Moon when the halo appeared. The crater it marks, now named McGetchin, is 222 metres across and 43 metres deep, and a zone of ground seven kilometres across now runs 8 to 9 kelvin colder at night…
Robert Wagner was doing the kind of work that almost never produces anything. On 24 October 2025 he was running a quality check on a global map of the Moon. The job means stacking hundreds of wide-an… [+11328 chars]