https://www.scientificamerican.com/article/in-a-first-earthlings-spot-a-meteor-strike-the-eclipse-darkened-moon/

Late Sunday evening, as Earth’s shadow painted the full moon’s face a deep, rusty red, a wayward meteor smashed into the lunar surface. The collision’s aftermath—a brief flash of light at the bloody orb’s darkest edge—lasted just long enough for some sharp-eyed eclipse viewers to spot.

Such impacts are normally “hard to detect,” says Ryan Watkins of the Planetary Science Institute. “Most of the impacts are very small,” she notes, “and we can only see them on portions of the moon that are dark or only slightly illuminated.”