Edwin Hubble
He confirmed that the recessional velocity of a galaxy increases with its distance from Earth, a behavior known as Hubble's law, which implies the universe is expanding.
- born
- November 20, 1889
- died
- September 28, 1953
- nationality
- American
- known_for
- Proving galaxies exist beyond the Milky Way; Hubble's law; galaxy classification
Lore & Background
in 1917. He also devised the Hubble sequence, a system for classifying galaxies by appearance.
Reader's Guide
Edwin Hubble's work fundamentally changed the scientific view of the universe. Hubble's classification system for galaxies remains a standard tool. His work, though based on distance estimates later found to be too small, established a proportional relationship that proved foundational. Hubble's career spanned from athletic achievement to pioneering research, and his contributions remain central to our understanding of the universe's structure and expansion.
Did You Know?
- Hubble helped the University of Chicago's basketball team win its first Big Ten Conference title in the 1907–1908 season.
- He taught Spanish, physics, and basketball at New Albany High School in Indiana before earning his Ph.D.
- During World War II, Hubble served as Chief of the External Ballistics Branch at Aberdeen Proving Ground and received the Legion of Merit.
- He became the first astronomer to use the 200-inch Hale Telescope at Palomar Observatory shortly before his death.
Frequently Asked Questions
Who is Edwin Hubble?
Edwin Powell Hubble (1889–1953) was an American astronomer widely credited with founding extragalactic astronomy and observational cosmology. His work reshaped how humanity understands the scale and structure of the universe.
What is Hubble's law?
Hubble's law states that a galaxy's recessional speed grows in direct proportion to its distance from Earth. This simple linear relationship became the primary evidence that the universe is expanding rather than static.
How did Hubble prove galaxies exist beyond the Milky Way?
By measuring the distances to objects previously labeled as 'nebulae' and showing they lay far outside our own galaxy, he demonstrated that the Milky Way is just one of many separate island universes. This discovery shattered the long-held assumption that the Milky Way contained everything.
Why is Edwin Hubble important?
He expanded the known universe from a single galaxy to an immense collection of galaxies and provided the observational proof of cosmic expansion. His contributions laid the groundwork for modern cosmology and the Big Bang model.
What is Hubble's galaxy classification system?
Hubble devised a visual scheme that sorts galaxies into elliptical, spiral, and irregular types based on their shape and structure. This framework remains the standard way astronomers categorize and compare galaxies to this day.
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