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Its story

20 Ceti is a cool red giant in Cetus, an autumn-water constellation tied to the sea-monster of Andromeda's myth. Its surface does not reach 4,000 kelvin: it burns with the coppery, serene red of stars that have exhausted the hydrogen in their core and swollen to colossal proportions. The light grazing the pupil tonight left its atmosphere 587 years ago, when the Italian Renaissance was only beginning to rewrite the world.