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What is the diameter of the Shapley supercluster?
Super clusters do not have defined boundaries, not a defined shape. A ballpark figure would put the diameter at about 100 million light years, but extending to about 250 million light years at the extreme. See related link for a pictorial of the cluster
Who was the first astronomer to get a reasonable idea of the size and shape of the galaxy?
The first astronomer to propose a reasonable idea of the size and shape of the galaxy was Harlow Shapley in the early 20th century. He used the variable stars known as Cepheid variables to estimate the size of the Milky Way and its position within it. His work helped establish the notion of the galaxy as a vast, spiral-shaped structure.
How did shapely and oort say your galaxy compares to most others?
Shapley discovered that the Milky Way is not at the center of the universe, but rather on its outer edge. Oort determined that the galaxy is rotating and that the Sun is located about halfway between the center and the edge.
What fundamental principle did Shapely use to calibrate the period-luminosity relationship for Cepheid variable stars?
Shapley used the principle that the pulsation period of a Cepheid variable star is directly linked to its intrinsic luminosity. By observing Cepheids in nearby galaxies with known distances, he was able to establish a relationship between the period of pulsation and the luminosity of the star, known as the period-luminosity relationship. This key principle provided a way to accurately measure distances to galaxies and paved the way for understanding the scale of the universe.
Who was George E. Hale and what did he discover?
George Ellery Hale (June 29, 1868 - February 21, 1938) was an American solar astronomer, born in Chicago. He was educated at MIT, at the Observatory of Harvard College, (1889-90), and at Berlin (1893-94). As an undergraduate at MIT, he invented the spectroheliograph, with which he made his discoveries of the solar vortices and magnetic fields of sun spots. In 1890 he was appointed director of the Kenwood Astrophysical Observatory; he was professor of Astrophysics at Beloit College (1891-93); associate professor at the University of Chicago until 1897, and full professor (1897-1905). He was coeditor of Astronomy and Astrophysics, 1892-95, and after 1895 editor of the Astrophysical Journal. Hale was a driven individual who worked to found a number of significant astronomical observatories, including Yerkes Observatory, Mount Wilson Observatory, Palomar Observatory, and the Hale Solar Laboratory. At Mount Wilson, he hired and encouraged Harlow Shapley and Edwin Hubble toward some of the most significant discoveries of the time. He was a prolific organizer who helped create a number of astronomical institutions, societies and journals. Hale also played a central role in developing the California Institute of Technology into a leading research university.
How did Harlow Shapley determine where the center of the galaxy lies?
Harlow Shapley determined the center of the galaxy by studying the distribution and motion of globular clusters. By observing the positions and velocities of these clusters, he discovered that they were not evenly distributed in the sky but rather congregated towards a point in the constellation Sagittarius, indicating the center of the galaxy.
What did Harlow Shapley discover?
Harlow Shapley studied globular clusters and used the position of the clusters to locate the sun in the middle of our galaxy. He found out he was wrong but figured out that the sun was in one of the spiral arms in our galaxy
What main conclusion did Shapley draw from his measurements of the distances to the globular clusters?
The sun is far from the center of the Milky Way.
When was Olive Shapley born?
Olive Shapley was born in 1910.
When did Olive Shapley die?
Olive Shapley died in 1999.
When did Ronald Shapley die?
Ronald Shapley died in 1965.
When was Ronald Shapley born?
Ronald Shapley was born in 1890.
When was Harlow Shapley born?
Harlow Shapley was born on November 2, 1885.
What is Harlow Shapley's birthday?
Harlow Shapley was born on November 2, 1885.
When did Alan Shapley die?
Alan Shapley died on 1973-05-13.
When was Alan Shapley born?
Alan Shapley was born on 1903-02-09.
Why didn't astronomers before shapely realize how large the galaxy is?
Before Harlow Shapley’s work in the early 20th century, astronomers underestimated the size of the Milky Way galaxy due to limited observational data and a lack of understanding of its structure. They primarily viewed the galaxy as a collection of stars within a relatively small area, influenced by the bright band of the Milky Way visible from Earth. Shapley's research, particularly through the study of globular clusters and their distances, revealed the true scale of the galaxy, demonstrating that it was much larger than previously thought. This shift in perspective ultimately led to a more accurate understanding of our galaxy's vastness.
