How Did Astronomers Discover the Relationship Between Spectral Type and Mass

question 52

Multiple Choice

How did astronomers discover the relationship between spectral type and mass for main sequence stars?

• A) By measuring the masses and spectral types of main-sequence stars in binary systems
• B) By using computer models of hydrogen fusion and stellar structure
• C) By measuring stellar radii with very powerful telescopes
• D) By comparing stars with the same spectral type but different luminosities

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