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The Glass Universe: How the Ladies of the Harvard Observatory Took the Measure of the Stars Hardcover – December 6, 2016
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A New York Times Book Review Notable Book
Named one of the best books of the year by NPR, The Economist, Smithsonian, Nature, and NPR's Science Friday
Nominated for the PEN/E.O. Wilson Literary Science Writing Award
"A joy to read.” —The Wall Street Journal
In the mid-nineteenth century, the Harvard College Observatory began employing women as calculators, or “human computers,” to interpret the observations their male counterparts made via telescope each night. At the outset this group included the wives, sisters, and daughters of the resident astronomers, but soon the female corps included graduates of the new women's colleges—Vassar, Wellesley, and Smith. As photography transformed the practice of astronomy, the ladies turned from computation to studying the stars captured nightly on glass photographic plates.
The “glass universe” of half a million plates that Harvard amassed over the ensuing decades—through the generous support of Mrs. Anna Palmer Draper, the widow of a pioneer in stellar photography—enabled the women to make extraordinary discoveries that attracted worldwide acclaim. They helped discern what stars were made of, divided the stars into meaningful categories for further research, and found a way to measure distances across space by starlight. Their ranks included Williamina Fleming, a Scottish woman originally hired as a maid who went on to identify ten novae and more than three hundred variable stars; Annie Jump Cannon, who designed a stellar classification system that was adopted by astronomers the world over and is still in use; and Dr. Cecilia Helena Payne, who in 1956 became the first ever woman professor of astronomy at Harvard—and Harvard’s first female department chair.
Elegantly written and enriched by excerpts from letters, diaries, and memoirs, The Glass Universe is the hidden history of the women whose contributions to the burgeoning field of astronomy forever changed our understanding of the stars and our place in the universe.
- Print length336 pages
- LanguageEnglish
- PublisherViking
- Publication dateDecember 6, 2016
- Dimensions6.31 x 1.14 x 9.31 inches
- ISBN-100670016950
- ISBN-13978-0670016952
- Lexile measure1330L
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Editorial Reviews
From School Library Journal
Review
“Ms. Sobel writes with an eye for a telling detail and an ear for an elegant turn of phrase. . . . [The Glass Universe is] a joy to read.” —The Wall Street Journal
“Sobel lucidly captures the intricate, interdependent constellation of people it took to unlock mysteries of the stars . . . The Glass Universe positively glows.” —NPR
“An elegant historical tale…[from] the master storyteller of astronomy.” –The Boston Globe
"Sobel mixes discussions of the most abstruse topics with telling glimpses of her subjects’ lives, in the process showing how scientific and social progress often go hand in hand." –The New Yorker
"A peerless intellectual biography. The Glass Universe shines and twinkles as brightly as the stars themselves. –The Economist
“At once an exhaustive and detailed account of a breakthrough moment in the world of science, as well as a compelling portrait of pioneering women who contributed as much to the progress of female empowerment as they did to the global understanding of both astronomy and photography.” —Harper’s Bazaar
"[Sobel] traces a remarkable line in American female achievement…[and] captures the stalwart spirit of Pickering’s female finds." —USA Today
“Sobel has distinguished herself with lucid books about scientists and their discoveries . . . [She] vividly captures how her brilliant and ambitious protagonists charted the skies, and found personal fulfillment in triumphant discovery.” —The National Book Review
“A fascinating and inspiring tale of . . . female pioneers who have been shamefully overlooked.” —Real Simple
"Sobel shines a light on seven 19th- and 20th-century women astronomers who began as 'human computers,' interpreting data at Harvard Observatory, then went on to dazzle...An inspiring look at celestial pioneers." —People
"An astronomically large topic generously explored." —O, The Oprah Magazine
"It takes a talented writer to interweave professional achievement with personal insight. By the time I finished The Glass Universe, Dava Sobel's wonderful, meticulous account, it had moved me to tears...Unforgettable." —Sue Nelson, Nature
"A compelling read and a welcome reminder that American women have long desired to reach for the stars.” —Bookpage
"Sensitive, exacting, and lit with the wonder of discovery." —Elizabeth Kolbert, Pulitzer Prize-winning author of The Sixth Extinction
"This is intellectual history at its finest. Dava Sobel is extraordinarily accomplished at uncovering the hidden stories of science." —Geraldine Brooks, New York Times bestselling author of The Secret Chord and Pulitzer Prize-winning author of March
“[Sobel] soars higher than ever before...[continuing] her streak of luminous science writing with this fascinating, witty, and most elegant history...The Glass Universe is a feast for those eager to absorb forgotten stories of resolute American women who expanded human knowledge." —Booklist, Starred Review
"Sobel knows how to tell an engaging story...With grace, clarity, and a flair for characterization, [she] places these early women astronomers in the wider historical context of their field for the very first time." —Publishers Weekly, Starred Review
Praise for The Planets
"[The Planets] lets us fall in love with the heavens all over again." —The New York Times Book Review
"[Sobel] has outdone her extraordinary talent for keeping readers enthralled. . . . A splendid and enticing book." —San Francisco Chronicle
"An incantatory serenade to the Solar System." —Entertainment Weekly
Praise for Galileo's Daughter
"Sobel is a master storyteller. . . . She brings a great scientist to life." —The New York Times Book Review
Praise for Longitude
"This is a gem of a book." —The New York Times
"A simple tale, brilliantly told." —The Washington Post
Praise for A More Perfect Heaven
"Ms. Sobel is an elegant stylist, a riveting and efficient storyteller, a writer who can bring the dustiest of subjects to full-blooded life." —The New York Times
"Lively, inventive . . . a masterly specimen of close-range cultural history."—The Wall Street Journal
About the Author
Excerpt. © Reprinted by permission. All rights reserved.
“There are no women assistants,” Miss Cannon noted of the Royal Observatory, Greenwich. Travel broadened her appreciation for the singularity of Harvard’s large female staff, although she easily befriended men wherever she went. At Greenwich, “Without the slightest feeling of being out of place, without the smallest tinge of embarrassment, I discussed absorbing work with one and another.” That evening the astronomer royal, Frank Dyson, called for Miss Cannon and Mrs. Marshall at their London hotel and escorted them to a soiree at Burlington House, the headquarters of the Royal Astronomical Society and four other scientific fraternities. “Never has it been my good fortune to have such a kindly greeting, such hearty good will, such wonderful feeling of equality in the great world of research as among these great Englishmen.” At the society’s meeting a few days later, she gave a formal presentation about her recent investigation into the spectra of gaseous nebulae.
Mrs. Marshall understandably avoided the scientific sessions, at which Miss Cannon inured herself to being the sole woman in a roomful of as many as ninety men. In Germany, she reported, “Not a single German woman attended these Hamburg meetings” of the Astronomische Gesellschaft. “Once or twice, two or three would come in for a few minutes but I was generally the only woman to sit through a session. This was not so pleasant but at the recesses the men were so kind that nothing seemed to matter, and at the luncheon women appeared in great numbers.”
In Bonn, where the Solar Union gathered from July 30 to August 5, the astronomers were treated to a flyby visit of a military zeppelin, a side trip to the Gothic cathedral at Cologne, a riverboat ride up the Rhine, and a gala night in the Bonn observatory that prompted the English-speaking delegates to sing “They Are Jolly Good Fellows” to Director Friedrich Küstner and his wife and daughters. “Luncheon and indeed all meals in Germany,” observed Canadian astrophysicist John Stanley Plaskett, “are a much more important and solemn function than with us and take at least twice the time.”
Pickering, an elder statesman in this community, spoke at several banquets during the week. He shared impressions of his previous stays in Bonn, a city he had long regarded as the world capital of photometry. It was here that the legendary Friedrich Wilhelm Argelander assembled the Bonner Durchmusterung star catalogue and perfected the Argelander method of studying variables by comparing them to their steady neighbors. Argelander’s own small telescope, still mounted at the Bonn observatory, proved an object of veneration for the visiting astronomers.
Only about half the members of Pickering’s Committee on Spectral Classification, first convened at Mount Wilson, had come to the Bonn meeting. Those present included Henry Norris Russell, Karl Schwarzschild, Herbert Hall Turner, and of course Küstner, of the local observatory. They met Thursday afternoon, July 31, to polish their report before Friday’s discussion and vote. The group had considered incorporating some symbols into the Draper classification that would account for the widths of spectral lines, but ultimately rejected the idea. Rather than retrofit the Draper system, they preferred to look forward and explore the possibility of an entirely new design for stellar taxonomy.
On Friday morning Chairman Pickering read the committee’s recommendation to the full assembly at the Physical Institute. He proposed postponing “the permanent and universal adoption” of any system until the committee could formulate a suitable revision. In the interim, however, everyone should foster the well-known and widely praised Draper classification. Approval of the resolution was swift and unanimous. Ditto the subresolution regarding a refinement originally suggested by Ejnar Hertzsprung and already practiced by Miss Cannon. It consisted of a zero subscript for lone letters. Going forward, A0 would denote a star of purely A‑category attributes, showing no B tendencies whatever. The new A0 reduced plain A to a “rough” categorization.
At the final session on August 5, the Solar Union dissolved its old committees and regrouped into new ones for the work to be done over the next three years, before they would all meet again in Rome. “When the names of committees were read,” wrote Miss Cannon, “I was very much surprised to find that I was put on the Committee on Classification of Stellar Spectra—and one of the novel experiences of the summer was to meet with this Committee. They sat at a long table, these men of many nations, and I was the only woman. Since I have done almost all the world’s work in this one branch, it was necessary for me to do most of the talking.”
Product details
- Publisher : Viking; First Edition (December 6, 2016)
- Language : English
- Hardcover : 336 pages
- ISBN-10 : 0670016950
- ISBN-13 : 978-0670016952
- Lexile measure : 1330L
- Item Weight : 1.25 pounds
- Dimensions : 6.31 x 1.14 x 9.31 inches
- Best Sellers Rank: #526,028 in Books (See Top 100 in Books)
- #790 in Astronomy (Books)
- #1,463 in Women in History
- #1,639 in History & Philosophy of Science (Books)
- Customer Reviews:
About the author

Dava Sobel (born June 15, 1947, The Bronx, New York) is an American writer of popular expositions of scientific topics. Her books include Longitude, about English clockmaker John Harrison, and Galileo's Daughter, about Galileo's daughterMaria Celeste.
Bio from Wikipedia, the free encyclopedia. Photo by Ragesoss (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons.
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Customers find this book engaging and well-researched, making it a must-read for astronomy enthusiasts. Moreover, the book provides accurate information about the history of astronomy and features fascinating women of science. Additionally, the writing style receives positive feedback, with one customer noting its conversational tone, and customers appreciate the female empowerment theme. However, the narrative quality receives mixed reactions, with several customers finding it hard to get through.
AI-generated from the text of customer reviews
Customers find the book engaging and well-researched, describing it as a must-read for astronomy enthusiasts.
"...Previous books (Longitude and Galileo's Daughter) are also well worth reading. She is thorough but never plodding in her retelling of history...." Read more
"...It's extremely interesting, but does read much like a textbook. Recommended to readers interested in astronomy." Read more
"...Though unrelated to Sobel's work, the appearance of the book is rather lovely as well." Read more
"...A must read for fans of astronomy, science, women's history or history in general." Read more
Customers appreciate the research quality of the book, finding it well-researched and informative, particularly highlighting the fascinating women of science featured.
"...women changing the course of astronomy by their hard work, scientific acumen and strokes of genius...." Read more
"...Recommended to readers interested in astronomy." Read more
"...Detectives", but her examination brings an unprecedented level of detail that demonstrates the significance of the women of the Harvard..." Read more
"...So, yes, Sobel does a good job of describing their contributions. But her narrative is on the dry side. I'm a big astronomy fan so I liked this book...." Read more
Customers appreciate the book's historical content, particularly its accurate information about astronomy and delightful accounts of scientific discoveries.
"...She is thorough but never plodding in her retelling of history. It feels alive, moving at times, and always interesting." Read more
"The Glass Universe gives us a unique history of the study of the Universe starting in the late 1800's, and highlights all of woman who tirelessly..." Read more
"...There is so much information -- unwrapping the life stories of many astronomers -- that I frequently flipped back and forth between sections to..." Read more
"This was a fantastic book about the early days of astronomy and the importance of Harvard University in many, many discoveries that led to..." Read more
Customers praise the writing quality of the book, finding it delightfully and thoughtfully composed, with one customer noting its unique ability to distill complex information into clear sentences.
"...course of astronomy by their hard work, scientific acumen and strokes of genius...." Read more
"...For the rest of us, this is an upbeat, insightful, and hopeful work that shows the work of exploration is not just for the boys anymore." Read more
"...Written in a conversational style and aimed at general readers, this is an engaging story of clues and discoveries made possible by the ambitious..." Read more
"...Great reading. Also enjoy Longitude by this same author. Great writer." Read more
Customers appreciate the book's focus on female empowerment, highlighting brilliant women pioneers in astronomy and photography, with one customer noting how it honors unsung heroines.
"...Instead, we see strong and brilliant women changing the course of astronomy by their hard work, scientific acumen and strokes of genius...." Read more
"...her subject astronomers with admiration and love, describing women pioneers in photography; spectroscopy; stellar origins, evolution, and chemistry;..." Read more
"...A must read for fans of astronomy, science, women's history or history in general." Read more
"...and astrophysical discovery and invention, with the appreciation of underappreciated folks, in this case the women "computers" of Harvard..." Read more
Customers find the narrative of the book hard to get through, with one customer describing it as a dense recital of events and facts.
"...than from the science viewpoint, you're going to find this history a little tedious. Recommended for science and astronomy buffs...." Read more
"...I admire their dedication. Their work was tedious, but they never gave up." Read more
"...is so vast that too much of the book is a rapid and dense recital of events and facts, nonetheless it proves interesting to the end." Read more
"...are not in those fields, then you will probably find this book tedious and frustrating...." Read more
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Top reviews from the United States
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- Reviewed in the United States on December 9, 2018I've been teaching general education astronomy classes for several years and had brought up the Harvard "Calculators" in lecture, so I was eager to get a more in-depth understanding of that era in astronomy. I had expected to read about how poorly the women were treated, kept from telescope work and relegated to menial tasks of looking at photographic plates, etc. Instead, we see strong and brilliant women changing the course of astronomy by their hard work, scientific acumen and strokes of genius. The expected resistance to women in leadership roles is there, to be sure, but not so much within the Harvard observatory community as from the university higher-ups. Several of these "calculator" women were internationally recognized as leaders in the field. Even the wealthy benefactors (such as Henry Draper's widow, Anna Draper), who helped the observatory's work to greatly expand, were women.
Whether you're specifically interested in the subject of women in science or not, this book is just a great snapshot of science history, period. From the late 1800's, when next to nothing was known about what stars were made of, their lifecycle, whether there were other galaxies or not, etc., to the work of Edwin Hubble in the 1920's and 30's, with the discovery of an expanding universe populated by untold numbers of galaxies, a scientific road runs through the work of the ladies of the Harvard Observatory. The "big names" (like Hubble, Hertzsprung, Russell) were indebted to their work.
In short, another great book from Dava Sobel. Previous books (Longitude and Galileo's Daughter) are also well worth reading. She is thorough but never plodding in her retelling of history. It feels alive, moving at times, and always interesting.
- Reviewed in the United States on March 11, 2023The Glass Universe gives us a unique history of the study of the Universe starting in the late 1800's, and highlights all of woman who tirelessly gave of their talent to categorized stars. It's extremely interesting, but does read much like a textbook. Recommended to readers interested in astronomy.
- Reviewed in the United States on June 8, 2017In "The Glass Universe: How the Ladies of the Harvard Observatory Took the Measure of the Stars", Dava Sobel examines the spectroscopy work performed at Harvard under the auspices of the Henry Draper Memorial. Sobel's narrative begins with the work of Draper, who took spectroscopic photographs of the stars through a telescope, but died before having the opportunity to examine them. His widow, wishing to see the work completed, endowed the Harvard Observatory with a grant to catalogue the images and make further photographic and spectroscopic examinations, leading to the discovery of the chemical nature of the stars. Sobel's work examines the lives and work of the women who worked as computers, counting the Fraunhofer lines on the stellar spectra and creating a system to interpret it. Most interesting of all, despite working in the late nineteenth and early twentieth centuries in a field dominated by men, the ladies and their contributions were recognized both in the United States and abroad. Williamina Paton Stevens Fleming, who worked as a maid before establishing a system to classify the stars, and Annie Jump Cannon, a Wellesley graduate, both stand out in this narrative for their dedication and exactitude in their work as well as their lasting contributions to science. The history Sobel examines is fundamental to our understanding of the universe and so has appeared before, in "Cosmos" and Alan Hirshfeld's "Starlight Detectives", but her examination brings an unprecedented level of detail that demonstrates the significance of the women of the Harvard Observatory in their own time along with the challenges they faced, often working on a shoestring budget or without pay. Beyond her subjects' research, Sobel explores the nature of academia and academic funding in the late nineteenth and early twentieth centuries, showing how research that would easily receive university and financial support in the twentieth century struggled at times in the era on which she focuses. Sobel's title refers to the massive collection of glass photographic plates accumulated in the Harvard collection as a result of their research (pg. 203). The research and writing are everything readers expect of Sobel and a delight to delve into, sharing in her narrative. Though unrelated to Sobel's work, the appearance of the book is rather lovely as well.
Top reviews from other countries
Dola BhattacharyyaReviewed in India on July 15, 20194.0 out of 5 stars Awesome book
Nice book
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Cliente AmazonReviewed in Brazil on February 23, 20175.0 out of 5 stars Excelente compra!
O livro chegou em ótimo estado, bem protegido, bem embalado. Este é um livro excelente para quem está interessado em conhecer um pouco mais sobre a história da física. Super indicado!!
SallyReviewed in the United Kingdom on April 27, 20245.0 out of 5 stars Credit where Credit is due!!
This book is very well researched and very informative. For anyone with connections to any of the people mentioned or for people interested in the history of astronomy and the contributions of brilliant women, this book is for you,
G. L. RussellReviewed in the United Kingdom on January 8, 20185.0 out of 5 stars Fascinating account of womens' contributions to astrophysics
I had high expectations of this book and it didn't disappoint. This is a very readable account of how a group of women, encouraged by enlightened directors, performed ground-breaking work in the new discipline of astrophysics. Nerdy as it may appear, I found this book to be a page turner.
roderick garlandReviewed in Canada on June 30, 20224.0 out of 5 stars Ladies Rule the Universe
These ladies weren't men's equals, they were superior, pioneering scientific advances into the realm of the new astronomical knowledge of the Universe. Great and easy read.

