physics – The Indiana History Blog

Vesto Slipher: Uncovering the Cosmos

This article was originally published on the Hoosier State Chronicles blog on August 26, 2016.

The known universe is big; insanely big! At a staggering age of 13.8 billion years, our observable universe has a diameter of 92 billion light-years. Over the last century, astronomers, physicists, and mathematicians have helped us understand a more precise measurement of the size of the universe and how it has changed over time. The prevailing theory is the “Big Bang,” which, “At its simplest, [it] talks about the universe as we know it starting with a small singularity, then inflating over the next 13.8 billion years to the cosmos that we know today.” A key component of Big Bang cosmology, “Expansion Theory,” stipulates that the universe is expanding, rather than a static state, which accounts for the changing distances of stars and galaxies. So, how did we come to this conclusion?

Red and blue shift. Courtesy of Caltech. — Blue and red shift. Courtesy of Caltech.

Part of our understanding of the expanding universe has benefited, in no small part, to an Indiana farmer’s son named Vesto Slipher. Slipher developed spectrographic methods that allowed researchers to see a Doppler effect in the distances of what were then called “spiral nebula,” what we today call galaxies. Simply put, by measuring the longer wavelength red shift (objects moving away) and shorter wavelength blue shift (objects moving closer), Slipher demonstrated that the universe was not static. In fact, it was expanding and often pushing objects towards each other. Slipher’s name doesn’t get regularly name-checked as one of the greatest scientists of all-time, but his contributions helped to establish our current view of the cosmos.

Vesto Melvin Slipher. Courtesy of the National Academy of Sciences.

Vesto Melvin Slipher was born on November 11, 1875 on the family farm in Mulberry, Indiana. As biographer William Graves Hoyt noted, Slipher’s early life on the farm “helped him develop the strong, vigorous constitution that later stood him in good stead for the more strenuous aspects of observational astronomy.” Slipher received a B.A. (1901), M.A. (1903), and Ph.D (1909) in Astronomy from Indiana University. His Ph.D. dissertation paper, The Spectrum of Mars, which tentatively identified atmospheric characteristics (namely, water vapor) on the red planet.

The Indianapolis Journal, June 19, 1901. Courtesy of Hoosier State Chronicles.

The Indianapolis Journal, June 8 1903. Courtesy of Hoosier State Chronicles.

Slipher’s professional career in science began in August of 1901, when he moved to Flagstaff, Arizona to fill a vacancy at the Lowell Observatory. Founded by the idiosyncratic Dr. Percival Lowell, Lowell Observatory became one of the foremost institutions of astronomy during the early 20^th century. As the Coconino Sun put it, the observatory, “is known and recognized all over world for its discoveries and correct calculations.”

Dr. Percival Lowell, founder of the Lowell Observatory. Courtesy of Wikipedia.

Lowell Observatory. Courtesy of the Wall Street Journal/State of Arizona.

Lowell’s chief pursuit with the observatory was to prove that there were inhabitants on Mars, and hired young Slipher to help him. As early as 1908, Slipher found evidence through his spectroscopic techniques that Lowell may be on to something. The Washington Herald reported that V. M. Slipher (newspaper articles almost always identified him in print with just his initials) and his brother, Earl C. Slipher, “discovered evidences of the presence of water in the atmosphere of Mars. . . .” Sometime later, on May 20, 1909, the Hopkinsville Kentuckian noted that Slipher’s observations, “favor the view that the whitecaps about Mars poles are composed of snow rather than of hoarfrost,” and that “prevalent conditions of Mars . . .are those of a mild but desert climate, such as Professor Percival Lowell has asserted exists there.”

The Washington Herald, April 05, 1908. Courtesy of Chronicling America.

Lowell’s interest in Mars, emboldened by Slipher’s results, intensified. In 1912, Slipher helped install a 13,000 feet high telescope in the San Francisco Mountains so as to refine his measurements. Slipher’s efforts culminated in a 1914 announcement of further confirmation to his Water Vapor hypothesis. The Washington, D.C. Evening Star wrote that, “while the amount of water is difficult to determine, the estimates placed it at about one-third that of the atmosphere of the earth.” While Slipher and Lowell never found Martians on the red planet, their findings established atmospheric models that are still corroborated by scientists to this day.

The Los Angeles Herald, November 24, 1909. Courtesy of Chronicling America.

With his research on Mars, Slipher was only getting started. His real passion was observing the position and velocities of “spiral nebula,” and he used his spare time away from his Mars projects to advance his research. His early successes convinced Dr. Lowell to give him time devoted to this research. It came with spectacular results. In 1912, Slipher began recording spectrographic results of the Andromeda Nebula (now known as the Andromeda Galaxy) and found that they were blue-shifting, which indicated that the nebula was “not within our galaxy.” “Hence we may conclude,” Slipher observed in his published findings, “that the Andromeda Nebula is approaching the solar system with a velocity of about 300 kilometers per second.” Within the next couple of years, Slipher also discovered that the Andromeda Nebula was also rotating as it traveled, and published these results in a subsequent article. From there, the results went to the press; the Daily East Oregonian published the findings in its November 15, 1915 edition. The Caldwell Watchmen in Columbia, Louisiana also reported that the Nebula was traveling at an unprecedented speed of “186 miles a second.” Similar articles were published in the Ashland, Oregon Tidings and the Albuquerque Evening Herald.

The East Oregonian, November 25, 1915. Courtesy of Chronicling America.

Slipher eventually observed the speeds of 15 nebulae, shared his findings at the 1914 American Astronomical Society meeting, and “received a standing ovation.” His results were then published by the society in 1915, demonstrating that the average velocity of these nebulae at 400 kilometers a second. A few years later, in 1921, Slipher found a record-breaking nebula called Dreyer’s Nebula (known today as IC 447) that was traveling away from our galaxy at 2,000 kilometers a second! With nebulae moving at varying velocities and in varying directions, Slipher’s research had started a conversation about the need to reevaluate the static theory of the universe. Why were these nebula acting like this?

The Washington, D.C. Evening Star, January 17, 1921. Courtesy of Chronicling America.

Edwin Hubble. Courtesy of Sonoma State University.

In comes Edwin Hubble, the lawyer-turned-astronomer with the dashing looks of a movie star who pushed our understanding of the universe even further (Like Slipher, Hubble also had an Indiana connection as he taught and coached basketball at New Albany High School during the 1913-14 academic year) . As physicist Lawrence Krauss noted, Hubble used Slipher’s data on spiral nebula, combined with new observations he obtained with colleague Milton Humason, to postulate a new cosmological law. This new theorem, called “Hubble’s Law,” argued that there was a direct “relationship between recessional velocity and galaxy distance.” In other words, the farther away a galaxy is, the faster it is moving. These results flew in the face of both Isaac Newton and Albert Einstein’s notions of the universe, which argued for a static universe. If Hubble was right, the universe was actually expanding.

To test this idea, Hubble began a new series of spectrographic experiments in the 1930s. The Muncie Post-Democrat reported on one of these experiments on November 25, 1938:

The answer [to the expansion theory], they said, may be found when the new 200-inch reflector, cast in Corning, N. Y., glassworks, is completed. If the universe is expanding, the giant reflector being built on Mt. Palomar, in California, may indicate the type of expansion. The new mirror will collect four times as much light as the 100-inch Hooker reflector now in use at Mt. Wilson.

The Muncie Post-Democrat, November 25, 1938. Courtesy of Hoosier State Chronicles.

These further experiments reaffirmed Hubble’s earlier conclusions and the expansionary model of the universe became the standard-model. The evidence was so overwhelming that Einstein changed his mind and accepted the expansionary theory. Like with his work on Mars, Slipher’s early observations helped to uncover a field-altering discovery, and as biographer William Hoyt concluded, his research “enabled astronomers to gauge the approximate age and dimensions of the known universe.”

Clyde Tombaugh, the discoverer of Pluto. He was assisted by Slipher in his discovery. Courtesy of NASA.

Even after his momentous research on spiral nebula, Slipher continued to be involved in key discoveries. For example, Slipher assisted in the discovery of the planet (now dwarf planet) Pluto! A January 2, 1920 article in the Coconino Sun recalled that, “Dr. Slipher said he believes it is true that there is an undiscovered planet. This belief is due to peculiar actions of Uranus, who gets kind of wobbly sometimes in her course around the sun.” To confirm these claims, Slipher brought young scientist Clyde Tombaugh onto the project in 1928. After many attempts of photographing the unknown body, and Slipher even missing it in some telescopic photographs, Tombaugh finally discovered Pluto on February 18, 1930. The New York Times later reported the discovery on April 16, 1930. “Denial to the contrary,” the Times wrote, “Dr. V. M. Slipher, director of the Lowell Observatory [here], believes evidence indicates that the recently discovered “Planet X” is the long-sought trans-Neptunian planet, and is not a comet.” While Tombaugh rightfully gets the credit for the discovery, Slipher’s hard work in assisting the young scientist should count as one of his accomplishments.

The Coconino Sun, January 2, 1920. Courtesy of Chronicling America.

Slipher in his later years. Courtesy of the New York Times.

Slipher retired from the Lowell Observatory in 1952 and spent the remaining years of his life involved in minor astronomical work and community affairs before he passed away in 1969, at the age of 94. While not a household name, Slipher’s achievements in astronomy are legendary, from his discovery of the atmospheric conditions of Mars and assisting with the discovery of Pluto to his ground-breaking research on spiral nebulae that led to our understanding of the expanding universe. In short, he helped science, and in turn humanity, further uncover the mysteries of the cosmos. Pretty good for a farm boy from Mulberry, Indiana.

Melba Phillips: Leader in Science and Conscience Part Two

Melba Philips, photograph, n.d., University of Chicago News Office, accessed http://www-news.uchicago.edu/releases/04/041116.phillips.shtml — Melba Phillips, photograph, n.d., University of Chicago News Office, accessed University of Chicago News Office.

See Part One to learn about Phillips’s contributions to physics via the Oppenheimer-Phillips effect and her work to prevent the future use of atomic energy for war.

The Second World War, particularly the use of the atomic bomb, gave way to the Cold War. Living in the shadow of the threat of a nuclear war with the Soviet Union induced anxiety among many Americans. While Senator Joseph McCarthy became the public face of fear of homegrown communists, many other paranoid and xenophobic senators participated in the witch hunts. In 1950, Nevada Senator Pat McCarran sponsored the McCarran Internal Security Act, which allowed for investigation of “subversive activities;” made an “emergency” allowance for detaining people suspected of such activity; and even made picketing a courthouse a felony if it “intended” to obstruct proceedings. The act also provided for a five-member committee with the Orwellian title of the Subversive Activities Control Board (SACB), which was headed by McCarran and tasked with rooting out communists, communist-sympathizers, and other “subversives.” The SACB, or the McCarran Committee as it was more commonly called, went to work immediately.

Demonstrators demand repeal of the Smith and McCarran Acts, circa July 19, 1950, Los Angeles, Charlotta Bass / California Eagle Photograph Collection, 1880-1986, Southern California Library for Social Studies and Research, http://digitallibrary.usc.edu/cdm/ref/collection/p15799coll102/id/1320 — Demonstrators demand repeal of the Smith and McCarran Acts, circa July 19, 1950, Los Angeles, Charlotta Bass / California Eagle Photograph Collection, 1880-1986, Southern California Library for Social Studies and Research.

In 1952, Melba Phillips was called to testify before the U.S. congressional committee on her political activity. According to an October 14, 1952 New York Times article, a witness claiming to be “a former Communist official” testified that “he helped set up secret units of Communist teachers” and that “300 of the 500 dues-paying Communist teachers in this city went into a secret set-up whose top unit consisted of leaders of the Teachers Union.” Several prominent New York teachers refused to confirm or deny communist leanings, while outside of the courthouse students and teachers gathered in protest, chanting “Pat McCarran, hit the sack. We want our professors back!”

According Dr. George Salzman, a University of Massachusetts at Boston professor who was a student of Phillips’s at that time ,

“She let the Committee counsel know that her lineage went back to the Mayflower, and she wasn’t about to take part in the witch hunt.”

Phillips was subsequently fired from her university positions due to a law which required the termination of any New York City employee who invoked the Fifth Amendment. Bonner explained, “McCarran was a specialist at putting people in the position in which they had to invoke the Fifth Amendment. It was a deliberate expression of the McCarthyism of the time.” In a 1977 interview, Phillips briefly discussed the incident (although she was reluctant because she was trying to keep the interviewer focused on her scientific accomplishments). She stated: “I was fired from Brooklyn College for failure to cooperate with the McCarran Committee, and I think that ought to go into the record . . . city colleges were particularly vulnerable, and the administration was particularly McCarthyite.” Phillips stated that she wasn’t particularly political. Her objection to cooperating had been a matter of principle.

New York Times, October 14, 1952, 1, accessed ProQuest Historical Newspapers.

Phillips did not let her dismissal extinguish her passion for science education. While unemployed, she wrote two textbooks, which became university classroom standards: Classical Electricity and Magnetism (1955) and Principles of Physical Science (1957).

Melab Phillips and Francis T. Bonner, Principles of Physical Science (Reading, MA: Addison-Wesley Publishing Company, Inc., 1957) — Melba Phillips and Francis T. Bonner, Principles of Physical Science (Reading, MA: Addison-Wesley Publishing Company, Inc., 1957).

In 1957, Phillips became the associate director of the Academic Year Institute of Washington University in St. Louis, a teacher-training school. Her appointment came at the behest of Edward Condon who had also been named as a security risk by the House Un-American Activities Committee in the early 1950s. On Condon’s decision to hire her, Phillips stated, “there was much discrimination against people who had had any trouble of a ‘political’ kind, and it took a lot of courage, It took courage to hire any of the people in trouble during that time.”

Edward Condon, photograph, n.d., accessed National Institute of Standards and Technology, https://www.nist.gov/news-events/events/2016/01/government-science-cold-war-america-edward-condon-and-transformation-nbs — Edward Condon, photograph, n.d., accessed National Institute of Standards and Technology.

At the institute she developed programs instructing high school teachers about how to teach elementary science and physics. She remained at Washington until 1962 when she joined the faculty of the University of Chicago. Among her accomplishments there, she worked to make science accessible to non-science majors. She also made laboratory work an important part of the student experience. She explained that “we worked very hard in our laboratory in Chicago . . . unless the students get ‘hands on,’ it seems they don’t fully understand the material.”

In 1966, she became president of the American Association of Physics Teachers, of which she had been a member since 1943. This respected organization was founded in 1930 as “a professional membership association of scientists dedicated to enhancing the understanding and appreciation of physics through teaching.” Phillips became not only AAPT’s first female president, but one of its most memorable and effective leaders. Phillips was proud of the work of the organization and wrote the official History of the AAPT. She worked to make physics more important to teachers at the high school level in addition to college. She stated,

“The people in the universities whose future depends on their writing more and more research papers have very little patience with the problems of education at a lower level. This has to do in part with why the Association of Physics Teachers ever got started.”

Phillips remained at the University of Chicago until she retired as Professor Emerita in 1972. Even after her retirement from the University of Chicago, she continued to teach at other schools as a visiting professor. She taught at the State University of New York, Stony Brook from 1972 to 1975, and at the Chinese Academy of Science in Beijing in 1980. Phillips was awarded more honors than can be mentioned without compiling an extensive list. Notably, however, in 1981, the AAPT awarded her the first Melba Phillips Award, created in her honor, “for exceptional contributions to physics education.”

In 1987, Brooklyn College publicly apologized for firing Phillips, and in 1997 created a scholarship in her name. Melba Phillips died on November 8, 2004 in Petersburg, Indiana at the age of 97. The New York Times referred to Phillips in her obituary as “a pioneer in science education” and noted that “at a time when there were few women working as scientists, Dr. Phillips was leader among her peers.” Her accomplishments helped pave the way for other women in the sciences. In a 1977 interview, Phillips addressed the problems women face in aspiring to science careers an a 1977 interview, stating:

We’re not going to solve them, but, as I’ve been saying all the time; if we make enough effort, we’ll make progress; and I think progress has been made. We sometimes slip back, but we never quite slip all the way back; or we never slip back to the same place. There’s a great deal of truth in saying that progress is not steady no matter how inevitable.

Melba Phillips: Leader in Science and Conscience Part One

Indiana native Melba Newell Phillips pioneered new physics theories, studied under the famous J. Robert Oppenheimer, worked passionately to improve science education, and advocated for women’s place at the forefront of science research. After the U.S. dropped atomic bombs on Japan at the end of World War II, Phillips and other scientists organized to prevent future nuclear wars. She took a great hit to her career during the Cold War as she stood up for the freedom to dissent in the oppressive atmosphere of McCarthyism. Colleagues and students have noted her “intellectual honesty, self-criticism, and style,” and called her “a role model for principle and perseverance.”

Phillips was born February 1, 1907 near Hazleton, Indiana. According to Women in Physics, Phillips graduated from high school at 15, earned a B.S. from Oakland City College in Indiana, taught for one year at her former high school, and went on to graduate school. In 1928, she earned a master’s degree in physics from Battle Creek College in Michigan and stayed there to teach for two years. In 1929 she attended summer sessions on quantum mechanics at the University of Michigan under Edward U. Condon. When she sought Condon’s help on a physics problem, her solution, rather than his, ended up being the correct one. This led to a lifelong friendship and Condon recommended Phillips for further graduate study at the University of California, Berkley. Here she pursued graduate research under Oppenheimer and earned her Ph.D. in 1933. Within a few years she was known throughout the physics world because of her contribution to the field via the Oppenheimer-Phillips effect.

J. Robert Oppenheimer, photograph, in Ray Monk, Inside the Centre: The Life of J. Robert Oppenheimer (2014)

The 1935 Oppenheimer-Phillips Effect explained “what was at the time unexpected behavior of accelerated deuterons (nuclei of deuterium, or ‘heavy hydrogen’ atoms) in reactions with other nuclei,” according to a University of Chicago press release. When Oppenheimer died in 1967, his New York Times obituary noted his and Phillips’s discovery as a “basic contribution to quantum theory.” Manhattan Project scientist and professor emeritus of chemistry at the State University of New York, Stony Brook Francis Bonner explained in the release that normally such an accomplishment, now considered “one of the classics of early nuclear physics, “would have meant a faculty appointment. However, Phillips received no such appointment, perhaps due in part to the Great Depression, but also likely because of her gender.

Instead, Phillips left Berkley to teach briefly at Bryn Mawr College (PA), the Institute for Advanced Study (NJ), and the Connecticut College for Women. On February 16, 1936, the New York Times reported that she was one of six women to receive research fellowships for the 1936-1937 academic year as announced by the American Association of University Women. The announcement read: “Melba Phillips, research fellow at Bryn Mawr, received the Margaret E. Maltby fellowship of $1,500 for research on problems of the application of quantum mechanics to nuclear physics.”

New York Times, February 16, 1936, N6, ProQuest Historical New York Times

In October of 1937 Phillips served as a delegate to the fall conference of the association at Harvard, where the discussion centered around the prejudices against women scientists that halted not only their careers, but scientific progress more generally. According to a 1937 New York Times article, Dr. Cecelia Gaposchkin, a Harvard astronomer, detailed the “bitter disappointments and discouragements” that faced women professionals in the field of science. Certainly, Phillips related, as her career moved forward slowly despite her achievements in physics.

Pupin Physics Laboratory, Columbia University, "Short History of Columbia Physics," accessed http://physics.columbia.edu/about-us/short-history-columbia-physics — Pupin Physics Laboratory, Columbia University, “Short History of Columbia Physics,” accessed http://physics.columbia.edu/about-us/short-history-columbia-physics

Finally, in 1938, she received a permanent teaching position at Brooklyn College. In 1944, she also began research at the Columbia University Radiation Laboratory. Phillips was highly regarded as a teacher and Bonner noted she became “a major figure in science education” who “stimulated many students who went on from there to very stellar careers.”

Meanwhile, the U.S. officially entered World War II with the December 7, 1941 bombing of Pearl Harbor. No previous war had been so dependent on the role of science and technology. From coding machines to microwave radar to advances in rocket technology, scientists were in demand by the war effort.

In July 1945, the Manhattan Project scientists successfully detonated an atomic bomb in the desert of Los Alamos, New Mexico. In August 1945, the U.S. dropped two atomic bombs on Japan, forcing the country to surrender and effectively ending World War II. Over 135,000 people were killed in Hiroshima and 64,000 in Nagasaki. Many thousands more died from fires, radiation, and illness. While a horrified public debated whether the bomb saved further causalities by ending the war or whether it was fundamentally immoral, scientists also dealt with remorse and responsibility.

Henry Stimson, Secretary of War in the Truman administration, stated, “this deliberate, premeditated destruction was our least abhorrent choice.” Oppenheimer, however, reflected, “If atomic bombs are to be added as new weapons to the arsenals of a warring world, or to the arsenals of nations preparing for war, then the time will come when mankind will curse the names of Los Alamos and of Hiroshima.” More bluntly, Oppenheimer told Truman, “Mr. President, I feel I have blood on my hands.” Many physicists retreated to academia, but some became politically active, especially in regard to preventing further destruction through scientific invention.

Representing the Association of New York Scientists, Phillips and leading Manhattan Project scientists helped organize the first Federation of American Scientists meeting in Washington, D.C. in 1945. The goal of the Federation was to prevent further nuclear war. That same year Phillips served as an officer in the American Association of Scientific Workers, an organization working to involve scientists in government and politics, to educate the public in the science, and to stand against the misapplication of science by industry and government. On August 16, 1945 the New York Times reported that Phillips and the other officers of the Association signed a letter to President Truman giving “eight recommendations to help prevent the use of atomic bombs in future warfare and to facilitate the application of atomic energy to peacetime uses.”

By the end of the 1940s, Melba Phillips’s accomplishments in physics and science education were well-known throughout the academic physics community. However, by the early 1950s, she was accused of being affiliated with communist subversives and fired from her university positions. What happened to this Hoosier physics pioneer?

Find out with Part Two, Melba Phillips: Leader in Science and Conscience.

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