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Given a scientific passage and an answer, generate a question for the given answer.

Passage: Visible light is only a small part of the electromagnetic spectrum. There are parts of the electromagnetic spectrum that humans cannot see. This radiation exists all around you. You just can't see it! Every star, including our Sun, emits radiation of many wavelengths. Astronomers can learn a lot from studying the details of the spectrum of radiation from a star. Answer: radiation
Output:
What does every star emit that humans cannot see?