What is one reason that Act 2 of The Monsters Are Due on Maple Street is considered science fiction as opposed to fantasy fiction?

Science fiction often builds its story around ideas that seem connected to science or technology, such as visitors from another planet. In Act 2, the events are tied to aliens, making “It involves aliens” the best reason to classify it as science fiction. A murder or a scary atmosphere can appear in many genres, and magic would point more toward fantasy.

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