Noctilucent clouds — the world's rarest clouds — appeared over the San Francisco Bay area during the early hours of Friday morning, just a few days after yet another rocket launch. Two days ago, Rain Hayes, a local photographer, saw the clouds sailing over Lake Merritt in Oakland at around 6.30 a.m. before sharing images of the rare sighting later on social media.'Strange bright cloud over Lake Meritt during the tail end of astronomical twilight this morning,' she wrote, while also notifying the National Weather Service's regional office.
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