Milton L. Humason
Encyclopedia
Milton Lasell Humason was an American astronomer
. He was born in Dodge Center
, Minnesota
.
He dropped out of school and had no formal education past the age of 14. Because he loved the mountains, and Mount Wilson in particular, he became a "mule skinner" taking materials and equipment up the mountain while Mount Wilson Observatory was being built. In 1917, after a short stint on a ranch in La Verne, he became a janitor
at the Mount Wilson Observatory
. Out of sheer interest, he volunteered to be a night assistant at the observatory. His technical skill and quiet manner made him a favorite on the mountain. Recognizing his talent, in 1919, George Ellery Hale
made him a Mt. Wilson staff member. This was unprecedented, as Humason did not have a Ph.D., or even a high school diploma. He soon proved Hale's judgment correct, as he made several key observational discoveries. He became known as a meticulous observer, obtaining photographs and difficult spectrogram
s of faint galaxies. His observations played a major role in the development of physical cosmology
, including assisting Edwin Hubble
in formulating Hubble's law
. He retired in 1957.
He discovered Comet C/1961 R1 (Humason), notable for its large perihelion distance.
Due to merest chance, Humason missed discovering Pluto
. Eleven years before Clyde Tombaugh
, Humason took a set of four photographs in which the image of Pluto appeared. There is persistent speculation that he missed discovering the planet because it fell on a defect in the photographic plate. This is unlikely given that it appeared in four separate photographs over three different nights.
Much of the work Humason performed was actually credited to Hubble, the two of whom worked together for many years.
He died in Mendocino
, California.
by astronomer Carl Sagan
, Humason's life and work are portrayed on screen in episode 10: The Edge of Forever
Astronomer
An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...
. He was born in Dodge Center
Dodge Center, Minnesota
As of the census of 2000, there were 2,226 people, 824 households, and 588 families residing in the city. The population density was 1,173.8 people per square mile . There were 859 housing units at an average density of 452.9 per square mile...
, Minnesota
Minnesota
Minnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
.
He dropped out of school and had no formal education past the age of 14. Because he loved the mountains, and Mount Wilson in particular, he became a "mule skinner" taking materials and equipment up the mountain while Mount Wilson Observatory was being built. In 1917, after a short stint on a ranch in La Verne, he became a janitor
Janitor
A janitor or custodian is a professional who takes care of buildings, such as hospitals and schools. Janitors are responsible primarily for cleaning, and often some maintenance and security...
at the Mount Wilson Observatory
Mount Wilson Observatory
The Mount Wilson Observatory is an astronomical observatory in Los Angeles County, California, United States. The MWO is located on Mount Wilson, a 5,715 foot peak in the San Gabriel Mountains near Pasadena, northeast of Los Angeles...
. Out of sheer interest, he volunteered to be a night assistant at the observatory. His technical skill and quiet manner made him a favorite on the mountain. Recognizing his talent, in 1919, George Ellery Hale
George Ellery Hale
George Ellery Hale was an American solar astronomer.-Biography:Hale was born in Chicago, Illinois. He was educated at MIT, at the Observatory of Harvard College, , and at Berlin . As an undergraduate at MIT, he is known for inventing the spectroheliograph, with which he made his discovery of...
made him a Mt. Wilson staff member. This was unprecedented, as Humason did not have a Ph.D., or even a high school diploma. He soon proved Hale's judgment correct, as he made several key observational discoveries. He became known as a meticulous observer, obtaining photographs and difficult spectrogram
Spectrogram
A spectrogram is a time-varying spectral representation that shows how the spectral density of a signal varies with time. Also known as spectral waterfalls, sonograms, voiceprints, or voicegrams, spectrograms are used to identify phonetic sounds, to analyse the cries of animals; they were also...
s of faint galaxies. His observations played a major role in the development of physical cosmology
Physical cosmology
Physical cosmology, as a branch of astronomy, is the study of the largest-scale structures and dynamics of the universe and is concerned with fundamental questions about its formation and evolution. For most of human history, it was a branch of metaphysics and religion...
, including assisting Edwin Hubble
Edwin Hubble
Edwin Powell Hubble was an American astronomer who profoundly changed the understanding of the universe by confirming the existence of galaxies other than the Milky Way - our own galaxy...
in formulating Hubble's law
Hubble's law
Hubble's law is the name for the astronomical observation in physical cosmology that: all objects observed in deep space are found to have a doppler shift observable relative velocity to Earth, and to each other; and that this doppler-shift-measured velocity, of various galaxies receding from...
. He retired in 1957.
He discovered Comet C/1961 R1 (Humason), notable for its large perihelion distance.
Due to merest chance, Humason missed discovering Pluto
Pluto
Pluto, formal designation 134340 Pluto, is the second-most-massive known dwarf planet in the Solar System and the tenth-most-massive body observed directly orbiting the Sun...
. Eleven years before Clyde Tombaugh
Clyde Tombaugh
Clyde William Tombaugh was an American astronomer. Although he is best known for discovering the dwarf planet Pluto in 1930, the first object to be discovered in what would later be identified as the Kuiper Belt, Tombaugh also discovered many asteroids; he also called for serious scientific...
, Humason took a set of four photographs in which the image of Pluto appeared. There is persistent speculation that he missed discovering the planet because it fell on a defect in the photographic plate. This is unlikely given that it appeared in four separate photographs over three different nights.
Much of the work Humason performed was actually credited to Hubble, the two of whom worked together for many years.
He died in Mendocino
Mendocino, California
Mendocino is a census-designated place in Mendocino County, California, United States. Mendocino is located south of Fort Bragg, at an elevation of 154 feet...
, California.
In popular culture
In the popular documentary Cosmos: A Personal VoyageCosmos: A Personal Voyage
Cosmos: A Personal Voyage is a thirteen-part television series written by Carl Sagan, Ann Druyan, and Steven Soter, with Sagan as presenter. It was executive-produced by Adrian Malone, produced by David Kennard, Geoffrey Haines-Stiles and Gregory Andorfer, and directed by the producers, David...
by astronomer Carl Sagan
Carl Sagan
Carl Edward Sagan was an American astronomer, astrophysicist, cosmologist, author, science popularizer and science communicator in astronomy and natural sciences. He published more than 600 scientific papers and articles and was author, co-author or editor of more than 20 books...
, Humason's life and work are portrayed on screen in episode 10: The Edge of Forever