Cecilia Payne and Annie J. Cannon are described in the material as which of the following?

Cecilia Payne and Annie J. Cannon are described in the material as which of the following?

• A. Sisters of the Sun (People)
• B. Founders of Spectroscopy
• C. Pioneers of Space Travel
• D. Early Moon Explorers

Answer: (A)

Two notable women who focused their careers on stars are described with a nickname that honors that work: “Sisters of the Sun.” Cecilia Payne-Gaposchkin and Annie Jump Cannon were Harvard astronomers who made lasting contributions to how we study stellar light. Payne showed that hydrogen is the most abundant element in stars, which dramatically changed our understanding of what stars are made of. Cannon helped develop the spectral classification system that organizes stars by their spectra, a framework we still use to compare stars across the sky. The material uses the phrase “Sisters of the Sun” to signal their shared focus on solar and stellar science and to recognize their pioneering roles as women in astronomy. The other options don’t fit their work or era—founders of spectroscopy, pioneers of space travel, or early Moon explorers describe different contributions. So the nickname that best fits is Sisters of the Sun.

Two notable women who focused their careers on stars are described with a nickname that honors that work: “Sisters of the Sun.” Cecilia Payne-Gaposchkin and Annie Jump Cannon were Harvard astronomers who made lasting contributions to how we study stellar light. Payne showed that hydrogen is the most abundant element in stars, which dramatically changed our understanding of what stars are made of. Cannon helped develop the spectral classification system that organizes stars by their spectra, a framework we still use to compare stars across the sky. The material uses the phrase “Sisters of the Sun” to signal their shared focus on solar and stellar science and to recognize their pioneering roles as women in astronomy. The other options don’t fit their work or era—founders of spectroscopy, pioneers of space travel, or early Moon explorers describe different contributions. So the nickname that best fits is Sisters of the Sun.