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Gothic Science Fiction (SF) is an overlapping subgenre that slants toward the macabre, and deeply atmospheric settings, but not outright horror. ('Atmospheric' in a literary and cultural, not climatological, sense.) Mary Shelley's Frankenstein is often cited as the first such novel. Algis Budry's novel Rogue Moon sets a determined pair against a deadly lunar enigma. Arthur C. Clarke's short story "A Walk in the Dark" is another example.