Edwin Hubble Diagram
Kirshner harvard smithsonian center for astrophysics 60 garden street cambridge ma 02138 contributed by robert p.
Edwin hubble diagram. As one of the first steps towards a coherent theory of galaxy evolution the american astronomer edwin hubble developed a classification scheme of galaxies in 1926 although this scheme also known as the hubble tuning fork diagram is now considered somewhat. Some are simple while others are very complex in structure. Kirshner october 21 2003 edwin hubble s classic article on the expanding universe appeared in pnas in 1929 hubble e.
Hubble s diagram showed that a galaxy s redshift increased linearly with its distance from earth. He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology. A straight line of positive slope on this diagram is the visual depiction of hubble s law.
Edwin powell hubble november 20 1889 september 28 1953 was an american astronomer. Edwin hubble in full edwin powell hubble born november 20 1889 marshfield missouri u s died september 28 1953 san marino california american astronomer who played a crucial role in establishing the field of extragalactic astronomy and is generally regarded as the leading observational cosmologist of the 20th century. He did this work with the world s largest telescope at the time at the hubble classified galaxies on the.
Hubble proved 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. Hubble s diagram and cosmic expansion robert p. There is hubble s zone of avoidance the hubble galaxy type the hubble sequence the hubble luminosity law for reflection nebulae the hubble luminosity profile for e galaxies the hubble constant the hubble time the hubble diagram the hubble redshift distance relation the hubble radius for the universe and now the hubble space telescope.
From this data he noticed a relationship which is now called hubble s law the law states that the farther away a galaxy is the faster it is moving away from us. Edwin hubble combined his measurements of the distances to galaxies with other astronomers measurements of redshift. Hubble s law can be easily depicted in a hubble diagram in which the velocity assumed approximately proportional to the redshift of an object is plotted with respect to its distance from the observer.
The chief result that a galaxy s distance is proportional to its redshift is so well known and so deeply embedded into the language of astronomy through the hubble diagram the hubble constant hubble s law and the hubble time that the article. The simplest explanation for hubble s observation and the one that hubble himself offered was that the entire universe is expanding just as einstein s equations predicted it should. The farther away a galaxy is the faster it moves away from us.
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