Edwin Powell Hubble (November 20, 1889 - September 28, 1953) was an American astronomer. He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology and is regarded as one of the most important astronomers of all time.
Hubble discovered that many objects previously thought to be clouds of dust and gas and classified as "nebulae" were actually galaxies beyond the Milky Way. He used the strong direct relationship between a classical Cepheid variable's luminosity and pulsation period (discovered in 1908 by Henrietta Swan Leavitt) for scaling galactic and extragalactic distances.
Hubble provided evidence that the recessional velocity of a galaxy increases with its distance from the earth, a property known as "Hubble's law", a preliminary version of which was proposed earlier by Georges Lemaître. Hubble's Law implies that the universe is expanding. A decade before, the American astronomer Vesto Slipher had provided the first evidence that the light from many of these nebulae was strongly red-shifted, indicative of high recession velocities.
Hubble's name is most widely recognized for the Hubble Space Telescope which was named in his honor, with a model prominently displayed in his hometown of Marshfield, Missouri.
Video Edwin Hubble
Biography
Edwin Hubble was born to Virginia Lee Hubble (née James) (1864-1934) and John Powell Hubble, an insurance executive, in Marshfield, Missouri, and moved to Wheaton, Illinois, in 1900. In his younger days, he was noted more for his athletic prowess than his intellectual abilities, although he did earn good grades in every subject except for spelling. Edwin was a gifted athlete playing baseball, football, basketball, and he ran track in both high school and college. He played a variety of positions on the basketball court from center to shooting guard. In fact Hubble even led the University of Chicago's basketball team to their first conference title in 1907. He won seven first places and a third place in a single high school track and field meet in 1906.
His studies at the University of Chicago were concentrated on law, which led to a bachelor of science degree in 1910. Hubble also became a member of the Kappa Sigma Fraternity. He spent the three years at The Queen's College, Oxford after earning his bachelors as one of the university's first Rhodes Scholars, initially studying jurisprudence instead of science (as a promise to his dying father), and later added literature and Spanish, and earning his master's degree.
In 1909, Hubble's father moved his family from Chicago to Shelbyville, Kentucky, so that the family could live in a small town, ultimately settling in nearby Louisville. His father died in the winter of 1913, while Edwin was still in England, and in the summer of 1913, Edwin returned to care for his mother, two sisters, and younger brother, as did his brother William. The family moved once more to Everett Avenue, in Louisville's Highlands neighborhood, to accommodate Edwin and William.
Hubble was also a dutiful son, who despite his intense interest in astronomy since boyhood, acquiesced to his father's request to study law, first at the University of Chicago and later at Oxford, though he managed to take a few math and science courses. After the death of his father in 1913, Edwin returned to the Midwest from Oxford, but did not have the motivation to practice law. Instead, he proceeded to teach Spanish, physics and mathematics at New Albany High School in New Albany, Indiana, where he also coached the boys' basketball team. After a year of high-school teaching, he entered graduate school with the help of his former professor from the University of Chicago to study astronomy at the university's Yerkes Observatory, where he received his PhD in 1917. His dissertation was titled "Photographic Investigations of Faint Nebulae". In Yerkes, he had access to one of the most powerful telescopes in the world at the time, which had an innovative 24 inch (61 cm) reflector.
After the United States declared war on Germany in 1917, Hubble rushed to complete his PhD dissertation so he could join the military. Hubble volunteered for the United States Army and was assigned to the newly created 86th Division, where he served in 2nd Battalion, 343 Infantry Regiment. He rose to the rank of lieutenant colonel, and was found fit for overseas duty on July 9, 1918, but the 86th Division never saw combat. After the end of World War I, Hubble spent a year in Cambridge, where he renewed his studies of Astronomy. In 1919, Hubble was offered a staff position at the Carnegie Institution for Science's Mount Wilson Observatory, near Pasadena, California, by George Ellery Hale, the founder and director of the observatory. Hubble remained on staff at Mount Wilson until his death in 1953. Shortly before his death, Hubble became the first astronomer to use the newly completed giant 200-inch (5.1 m) reflector Hale Telescope at the Palomar Observatory near San Diego, California.
Hubble also worked as a civilian for U.S. Army at Aberdeen Proving Ground in Maryland during World War II as the Chief of the External Ballistics Branch of the Ballistics Research Laboratory during which he directed a large volume of research in exterior ballistics which increased the effective fire power of bombs and projectiles. His work was facilitated by his personal development of several items of equipment for the instrumentation used in exterior ballistics, the most outstanding development being the high-speed clock camera, which made possible the study of the characteristics of bombs and low velocity projectiles in flight. The results of his studies were credited with greatly improving design, performance, and military effectiveness of bombs and rockets. For his work there, he received the Legion of Merit award.
Hubble was raised as a Christian but some of his later statements suggest uncertainty.
Hubble had a heart attack in July 1949 while on vacation in Colorado. He was taken care of by his wife, Grace Hubble, and continued on a modified diet and work schedule. He died of cerebral thrombosis (a spontaneous blood clot in his brain) on September 28, 1953, in San Marino, California. No funeral was held for him, and his wife never revealed his burial site.
Maps Edwin Hubble
Discoveries
Universe goes beyond the Milky Way galaxy
Edwin Hubble's arrival at Mount Wilson Observatory, California in 1919 coincided roughly with the completion of the 100-inch (2.5 m) Hooker Telescope, then the world's largest. At that time, the prevailing view of the cosmos was that the universe consisted entirely of the Milky Way Galaxy. Using the Hooker Telescope at Mt. Wilson, Hubble identified Cepheid variables (a kind of star that is used as a means to determine the distance from the galaxy - see also standard candle) in several spiral nebulae, including the Andromeda Nebula and Triangulum. His observations, made in 1922-1923, proved conclusively that these nebulae were much too distant to be part of the Milky Way and were, in fact, entire galaxies outside our own, suspected by researchers at least as early as 1755 when Immanuel Kant's General History of Nature and Theory of the Heavens appeared. This idea had been opposed by many in the astronomy establishment of the time, in particular by Harvard University-based Harlow Shapley. Despite the opposition, Hubble, then a thirty-five-year-old scientist, had his findings first published in The New York Times on November 23, 1924, and then more formally presented in the form of a paper at the January 1, 1925 meeting of the American Astronomical Society.
Hubble's findings fundamentally changed the scientific view of the universe. Supporters state that Hubble's discovery of nebulae outside of our galaxy helped pave the way for future astronomers. Although some of his more renowned colleagues simply scoffed at his results, Hubble ended up publishing his findings on nebulae. This published work earned him an award titled the American Association Prize and five hundred dollars from Burton E. Livingston of the Committee on Awards.
Hubble also devised the most commonly used system for classifying galaxies, grouping them according to their appearance in photographic images. He arranged the different groups of galaxies in what became known as the Hubble sequence.
Redshift increases with distance
In 1929, in his first published paper, Hubble examined the relation between distance and redshift of galaxies. Combining his measurements of galaxy distances with measurements of the redshifts of the galaxies by Vesto Slipher, and by his assistant Milton L. Humason, he found a roughly linear relation between the distances of the galaxies and their redshifts, a discovery that later became known as Hubble's law.
This meant, the greater the distance between any two galaxies, the greater their relative speed of separation. If interpreted that way, Hubble's measurements on 46 galaxies lead to a value for the Hubble Constant of 500 km/s/Mpc, which is much higher than the currently accepted value of 70 km/s/Mpc due to errors in their distance calibrations.
Yet the reason for the redshift remained unclear. In reality, Georges Lemaître, a Belgian Catholic priest and physicist, predicted on theoretical grounds based on Einstein's equations for General Relativity the redshift-distance relation two years before the discovery of Hubble's law. However, many cosmologists and astronomers (including Hubble himself) failed to recognize the work of Lemaître, with, to date, no remaining papers or verification that they found or accepted any link between Lemaître's work and Hubble's measurements. Hubble remained doubtful about Lemaître's interpretation for his entire life. In 1931 he wrote a letter to the Dutch cosmologist Willem de Sitter expressing his opinion on the theoretical interpretation of the redshift-distance relation:
Mr. Humason and I are both deeply sensible of your gracious appreciation of the papers on velocities and distances of nebulae. We use the term 'apparent' velocities to emphasize the empirical features of the correlation. The interpretation, we feel, should be left to you and the very few others who are competent to discuss the matter with authority.
Today, the "apparent velocities" in question are understood as an increase in proper distance that occurs due to the expansion of space. Light traveling through stretching space will experience a Hubble-type redshift, a mechanism different from the Doppler effect (although the two mechanisms become equivalent descriptions related by a coordinate transformation for nearby galaxies).
In the 1930s, Hubble was involved in determining the distribution of galaxies and spatial curvature. These data seemed to indicate that the universe was flat and homogeneous, but there was a deviation from flatness at large redshifts. According to Allan Sandage,
Hubble believed that his count data gave a more reasonable result concerning spatial curvature if the redshift correction was made assuming no recession. To the very end of his writings he maintained this position, favouring (or at the very least keeping open) the model where no true expansion exists, and therefore that the redshift "represents a hitherto unrecognized principle of nature."
There were methodological problems with Hubble's survey technique that showed a deviation from flatness at large redshifts. In particular, the technique did not account for changes in luminosity of galaxies due to galaxy evolution. Earlier, in 1917, Albert Einstein had found that his newly developed theory of general relativity indicated that the universe must be either expanding or contracting. Unable to believe what his own equations were telling him, Einstein introduced a cosmological constant (a "fudge factor") to the equations to avoid this "problem". When Einstein learned of Hubble's redshifts, he immediately realized that the expansion predicted by General Relativity must be real, and in later life he said that changing his equations was "the biggest blunder of [his] life." In fact, Einstein apparently once visited Hubble and tried to convince him that the universe was expanding. Hubble also discovered the asteroid 1373 Cincinnati on August 30, 1935. In 1936 he wrote The Observational Approach to Cosmology and The Realm of the Nebulae which explained his approaches to extra-galactic astronomy and his view of the subject's history.
In December 1941, Hubble reported to the American Association for the Advancement of Science that results from a six-year survey with the Mt. Wilson telescope did not support the expanding universe theory.
No Nobel Prize
At the time, the Nobel Prize in Physics did not recognize work done in astronomy. Hubble spent much of the later part of his career attempting to have astronomy considered an area of physics, instead of being its own science. He did this largely so that astronomers--including himself--could be recognized by the Nobel Prize Committee for their valuable contributions to astrophysics. This campaign was unsuccessful in Hubble's lifetime, but shortly after his death, the Nobel Prize Committee decided that astronomical work would be eligible for the physics prize. However, the prize is not one that can be awarded posthumously.
Stamp
On March 6, 2008, the United States Postal Service released a 41-cent stamp honoring Hubble on a sheet titled "American Scientists" designed by artist Victor Stabin. His citation reads:
Often called a "pioneer of the distant stars," astronomer Edwin Hubble (1889-1953) played a pivotal role in deciphering the vast and complex nature of the universe. His meticulous studies of spiral nebulae proved the existence of galaxies other than our own Milky Way. Had he not died suddenly in 1953, Hubble would have won that year's Nobel Prize in Physics.
(Note that the assertion that he would have won the Nobel Prize in 1953 is likely false, although he was nominated for the prize that year.)
The other scientists on the "American Scientists" sheet include Gerty Cori, biochemist; Linus Pauling, chemist, and John Bardeen, physicist.
Honors
- Awards
- Newcomb Cleveland Prize in 1924;
- Bruce Medal in 1938;
- Franklin Medal in 1939;
- Gold Medal of the Royal Astronomical Society in 1940;
- Legion of Merit for outstanding contribution to ballistics research in 1946;
- Named after him
- Asteroid 2069 Hubble;
- The crater Hubble on the Moon;
- Orbiting Hubble Space Telescope;
- Edwin P. Hubble Planetarium, located in the Edward R. Murrow High School, Brooklyn, NY.;
- Edwin Hubble Highway, the stretch of Interstate 44 passing through his birthplace of Marshfield, Missouri;
- Other notable appearances
- Hall of Famous Missourians 2003
- 2008 "American Scientists" US stamp series, $0.41.
- 2017 Indiana Basketball Hall of Fame
In popular culture
The play Creation's Birthday, written by Cornell physicist Hasan Padamsee, tells Hubble's life story.
A famous quote by Edwin Hubble goes: "Equipped with his five senses man explores the universe around him and calls the adventure Science".
In the popular documentary Cosmos: A Personal Voyage by astronomer Carl Sagan, Hubble's life and work are portrayed on screen in episode 10: The Edge of Forever.
See also
- Astronomy
- Distance measures
- Cosmic distance ladder
- Galaxies
- Hubble sequence
- Galaxy morphological classification
- Gerard de Vaucouleurs
- William Wilson Morgan
- Expansion of the universe
- Big bang
- General relativity
- Hubble's law
- Hubble constant
- Albert Einstein
- Hubble Space Telescope
- Edwin Hubble House, residence and National Historic Landmark in San Marino, California
- The Great Debate of April 26, 1920
References and notes
Further reading
- Bartusiak, Marcia. The Day We Found the Universe. New York: Pantheon, 2009.
- Christianson, Gale; Edwin Hubble: Mariner of the Nebulae Farrar Straus & Giroux (T) (New York, August 1995.)
- Hubble E.P., The Observational Approach to Cosmology (Oxford, 1937.)
- Hubble, E.P. (1936). The realm of the nebulae (PDF). Mrs. Hepsa Ely Silliman memorial lectures, 25. New Haven: Yale University Press. ISBN 9780300025002. OCLC 611263346. Archived from the original on September 29, 2012.
- Hubble, Edwin (1929). "A relation between distance and radial velocity among extra-galactic nebulae". PNAS. 15 (3): 168-173. Bibcode:1929PNAS...15..168H. doi:10.1073/pnas.15.3.168. PMC 522427 . PMID 16577160.
- Mayall, N.U., Edwin Powell Hubble Biographical Memoirs NAS 41
- Osterbrock, Donald E.; Joel A. Gwinn; Ronald S. Brashear (July 1993). "Edwin Hubble and the Expanding Universe". Scientific American. 269 (1): 84-89. Bibcode:1993SciAm.269a..84O. doi:10.1038/scientificamerican0793-84.
- Harry Nussbaumer and Lydia Bieri, Discovering the expanding universe. Cambridge University Press, 2009.
External links
- Time Profile
- Astronomy at the University of Louisville -- Photographs of Edwin Hubble at New Albany High School.
- Edwin Hubble bio -- Written by Allan Sandage
- O'Connor, John J.; Robertson, Edmund F., "Edwin Hubble", MacTutor History of Mathematics archive, University of St Andrews .
- American Physical Society's Hubble Bio
- Edwin Powell Hubble -- The man who discovered the cosmos
- The problem of the expanding universe, 1942 Edwin Hubble
Source of the article : Wikipedia
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