You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: BODIES OF WATER 
Clue: This sea that extends about 1,200 miles was referred to in ancient times as the Erythraean Sea

Answer: the red sea


Question: Category: WORLD EVENTS 
Clue: In 2003, 120 years after it made headlines, a book on this was subtitled "The Day the World Exploded"

Answer: the eruption of krakatoa


Question: Category: MEN OF SCIENCE 
Clue: "Somnium", an early work of science fiction, was written by this German & published posthumously in 1634

Answer:
johannes kepler