Final answer:
Gamma rays are high-energy electromagnetic radiation emitted by radioactive atoms and celestial events, posing risks to living tissues and requiring space instruments for study.
Explanation:
Gamma rays are a form of electromagnetic radiation with the shortest wavelengths and high energy levels. They are emitted by radioactive atoms during gamma decay and are produced in events such as the fusion reactions in stars and collapsing stars. Gamma rays are dangerous for living tissues due to their high energy levels and can only be studied using instruments in space.
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