Once upon a time in 1816, Mary Wollstonecraft Godwin gathered alongside Lord Byron, John Polidori, and the man who would become her husband, Percy Bysshe Shelley. A group of ambitious and creative writers, the quartet agreed to each write their own ghost story, but the woman who later became Mary Shelley was stuck with “that blank incapability of invention which is the greatest misery of authorship.” In other words, she had writer’s block. (Sing it, sister.) However, one night, after discussing the possibility of a man being reanimated by lightning, Shelley had an experience involving a bright stream of a moonlight, spilling into her room through the shutters. And then she wrote Frankenstein. Some have disputed her story about how she struggled for days to come with the story, saying that this was just a romanticized tale to hook her audience, but astronomers are now saying that she was probably not making it up: Mary Shelley was most likely witness to a “bright, gibbous moon” in the wee hours of June 16, 1816, which must have been a few struggle-filled days after the ghost story challenge.