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Last update: September 30, 2025

Henrietta Swan Leavitt: The Woman Who Measured the Universe

Henrietta Swan Leavitt (1868-1921)

A Childhood Marked by a Passion for Stars

Born on July 4, 1868 in Lancaster, Massachusetts, Henrietta Swan Leavitt (1868-1921) developed an early interest in astronomy. After studying at Oberlin College and Radcliffe College (then called the Society for the Collegiate Instruction of Women), she graduated in 1892.

Academic and professional journey:

Despite her modest salary ($0.30 per hour) and status as a woman in a male-dominated field, she devoted her life to studying variable stars.

The Revolutionary Discovery of Cepheids

1. The Study of Variable Stars

Leavitt focused on studying variable stars in the Magellanic Clouds, where she discovered:

2. The Period-Luminosity Law (1908-1912)

In 1908, she published her first observations, then in 1912, she clearly formulated the relationship that would later bear her name:

This discovery, although published under her supervisor Edward Pickering's name, would become the basis for measuring distances in the Universe.

Impact on Modern Astronomy

1. Measuring Cosmic Distances

Leavitt's law enabled:

2. Contemporary Applications

Even today, the period-luminosity relationship is used to:

Late Recognition and Legacy

Despite the importance of her discoveries, Leavitt received little recognition during her lifetime:

However, her legacy is now recognized:

Personal Life and End of Career

Despite fragile health (she lost her hearing during her career), Leavitt continued her work until her death:

In a letter to her nephew, she wrote: "I have spent my life trying to understand the stars, and I believe I have managed to wrest some of their secrets from them."

Henrietta Swan Leavitt's Major Contributions
FieldYearContributionImpact
Stellar Astronomy1908Discovery of 2400 variable starsDoubled the number of known variable stars, foundation for future studies
Cosmology1912Cepheid period-luminosity lawEnabled measurement of cosmic distances, foundation of the extragalactic distance scale
Photometry1907-1921Head of stellar photometry departmentDeveloped standardized methods for measuring stellar luminosity
Cataloging1904-1921Catalog of variable starsStandard reference used for decades, basis of the Harvard Variable Star Catalogue

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