Table of Contents
- 1 Who noticed that most galaxies have spectral shifts that move toward the red end of the spectrum?
- 2 What did vesto Slipher discover?
- 3 How can astronomers determine whether a star is moving toward or away from earth?
- 4 Who discovered that the spectra of most spiral nebulae were redshifted?
- 5 What was Edwin Hubble famous for?
Who noticed that most galaxies have spectral shifts that move toward the red end of the spectrum?
Beginning in 1912, and making heroic efforts over a period of about 20 years, Slipher managed to photograph the spectra of more than 40 of the spiral nebulae (which would all turn out to be galaxies). To his surprise, the spectral lines of most galaxies showed an astounding redshift.
What did vesto Slipher discover?
Slipher’s extensive investigations led to the determination of the rotational periods of several planets. His discovery of dark absorption bands in the spectra of Jupiter, Saturn, and Neptune led to the identification of some of the chemical constituents of their atmospheres.
How did vesto Slipher discover redshift?
Combining his own measurements of galaxy distances with Vesto Slipher’s measurements of the redshifts associated with the galaxies, Hubble and Milton Humason discovered a rough proportionality of the objects’ distances with their redshifts. Slipher died in Flagstaff, Arizona and is buried there in Citizens Cemetery.
How astronomers determined that the Universe is expanding?
American astronomer Edwin Hubble and others discovered in the 1920s that the Universe is expanding by showing that most galaxies are receding from the Milky Way — and the farther away they are, the faster they are receding. The roughly constant ratio between speed and distance became known as the Hubble constant.
How can astronomers determine whether a star is moving toward or away from earth?
Simply by looking at the colors of light from a star, astronomers can figure out how fast that star is moving relative to earth using the Doppler shift. Any spectral color of light can shift to any other spectral color if the motion of the source is right.
Who discovered that the spectra of most spiral nebulae were redshifted?
“Red Shift” is Proof of Einstein’s General Theory. Using the 100-inch Hooker Telescope at Mount Wilson Observatory, Dr. Edwin Hubble has studied many spiral nebulae. He has discovered they are moving away from us at a rapid pace.
What type of Doppler shift did Edwin Hubble and Vesto Slipher find while observing the nebulae?
Analyzing the light from the nebulae, Slipher found that nearly all of them appeared to be moving away from Earth. Slipher knew that a shift toward red suggested the body was moving rapidly away from the observer.
Who discovered redshift?
astronomer Edwin Hubble
American astronomer Edwin Hubble (who the Hubble Space Telescope is named after) was the first to describe the redshift phenomenon and tie it to an expanding universe. His observations, revealed in 1929, showed that nearly all galaxies he observed are moving away, NASA said.
What was Edwin Hubble famous for?
Like the Hubble Space Telescope, Edwin Hubble’s discoveries transformed the frontier of scientific knowledge. His work took us beyond the Milky Way and placed us in an ever-expanding universe with a myriad of galaxies beyond our own.