In May 2024, the moon received a visitor it could not refuse — a fragment of deep space that carved a wound nearly 730 feet wide into its ancient surface, unseen by any human eye. More than a year passed before NASA's Lunar Reconnaissance Orbiter, sifting through its patient archive of images, revealed what had quietly transpired. The discovery, published this week in Science Advances, reminds us that even the familiar face of the moon harbors secrets, and that the cosmos operates on timescales indifferent to our observation of it.