A comic strip titled "Be Scientific with Ol' Doc Dabble" appeared in the Los Angeles Times #OTD in 1934, quoting the predictions by Fritz Zwicky and Walter Baade of neutron stars, supernova, and the origin of cosmic rays.
Image: Associated Press, @latimes
Zwicky and Baade submitted their papers "On Super-Novae" and "Cosmic Rays from Super-Novae" in March of that year. The papers weren't published until May, so this comic strip was published beat the papers to print by a full four months.
Baade had been using the term "super-novae" in his lectures at Caltech since the early 1930s, and he and Zwicky talked about their work (and used that term) at an APS meeting in 1933. So word had gotten out. There was enough awareness of their work to prompt a comic strip!
The quote they attribute to Zwicky is “Cosmic rays are caused by exploding stars which burn with a fire equal to 100 million suns and then shrivel from 1/2 million mile diameters to little spheres 14 miles thick.”
Zwicky would later say: "This, in all modesty, I claim to be one of the most concise triple predictions ever made in science. More than 30 years were to pass before this statement was proved to be true in every respect."
The strip shows "Doc Dabble" looking through a telescope. But it should be noted that at the time, many if not most observations were still processed and scrutinized by teams of talented women working under the supervision of a handful of men who directed the observatories.
They don’t show up in the strip, though.
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Entertainer, childhood literacy advocate, and scientific philanthropist Dolly Parton was born #OTD IN 1946. Mostly known for her singing and songwriting, her Imagination Library program has distributed over 100 million free books to kids around the world. dollyparton.com/imagination-li…
And Dolly's contributions to Vanderbilt University Medical Center's research efforts in the early days of the pandemic helped support the development of Moderna's Covid-19 vaccine. cnn.com/2020/11/18/ent…
Normally I do #OTD posts for scientists and mathematicians, or important discoveries. But @DollyParton has probably done as much as any living person to promote childhood literacy so I am proud to put her on the list.
Physicist Yoichiro Nambu (南部 陽一郎) was born #OTD in 1921. He developed a theory of spontaneous symmetry breaking to explain superconductivity, paving the way for electroweak symmetry breaking via the Higgs mechanism in the Standard Model.
Image: AIP Emilio Segre Archives
Nambu gave a lovely explanation of spontaneous symmetry breaking. Folks in a crowd might be looking in all different directions with no direction preferred. Occasionally, one person's choice propagates through the crowd. Soon everyone is looking in the same direction. That's SSB.
In physics we try to formulate theories (the rules for a physical system) in a way that makes symmetries manifest (obvious to anyone reading the rules). For instance, compatibility with special relativity means the rules should take the same form in any inertial reference frame.
Edwin Hubble submitted his paper "A relation between distance and radial velocity among extra-galactic nebulae" #OTD in 1929. It showed that "extra-galactic nebulae" were moving away from us with a velocity that increased linearly with distance.
Image: Carnegie Observatories
Hubble built on earlier work by Henrietta Swan Leavitt and Vesto Slipher, and used data that he collected with Milton Humason. You can read the paper in the Proceedings of the National Academy of Sciences, here: pnas.org/content/15/3/1…
(Both Lemaître and Robertson had published similar results which Hubble may have been aware of but did not cite.)
Albert Einstein presented a remarkable paper by Karl Schwarzschild to the Prussian Academy #OTD in 1916. It gave the exact form, according to general relativity, of the gravitational field outside a static, spherically symmetric mass. archive.org/details/sitzun…
This was the first analytic solution (besides the obvious one: Minkowski spacetime) of Einstein's notoriously difficult field equations. Einstein was delighted! He had assumed that the complexity of his equations would limit physicists to approximate and perturbative solutions.
Einstein presented the paper because Schwarzschild, serving in the German army, was off at the Russian front. He passed away that May, probably from an illness that developed during that period. Einstein would eulogize Schwarzschild just six months after presenting his paper.
Physicist and mathematician Isaac Newton was born #OTD in 1643. He revolutionized our understanding of mathematics, mechanics, gravity, and optics, then foiled counterfeiters as warden of the Royal Mint.
Portrait: Barrington Bramley, after Godfrey Kneller
Newton's "Philosophiæ Naturalis Principia Mathematica” was published in 1687. It lays out his three Laws of Motion, which explain the relationship between the forces and changes in an object’s motion, and his universal law of gravitation.
You can page through Newton's own annotated copy of his Principia here, courtesy of the Cambridge University Library. (You can also download copies of individual pages.) cudl.lib.cam.ac.uk/view/PR-ADV-B-…