PSAT NMSQT Practice Exam

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The following text is from a biography of astronomer Annie Jump Cannon. "Working at the Harvard College Observatory, Cannon classified hundreds of thousands of stars. Her system of organizing stars by temperature became the international standard still used today." According to the text, what was a lasting result of Cannon's work?

Her classification system became the international standard. She built the Harvard College Observatory. She discovered the temperature of the Sun. She trained most modern astronomers.

Correct Answer:

Her classification system became the international standard.

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