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Bidelman's groundbreaking work was primarily in what field of astronomy?

  • Astrophotography

  • Astrobiology

  • Spectroscopy

  • Cosmology

Answer

Spectroscopy, the study of the interaction of light and matter, was the field in which Bidelman made significant contributions. Through spectroscopy, astronomers can analyze the composition, temperature, and motion of celestial objects by examining the light they emit or absorb. Bidelman's work in this field helped advance our understanding of the universe and laid the foundation for further groundbreaking discoveries.
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