Enlarge (credit: Natural History Museum of Denmark et al.) You might not think of giant impact craters as being particularly subtle or in any way capable of hiding from us. If so, you’ll be surprised by the discovery, announced this week, of a 31-kilometer- (19-mile-) wide crater we didn’t know existed. Let’s get the important questions out of the way—no, the crater isn’t home to a Godzilla or some Lovecraftian horror.