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Because - in most cases - they are moving away from us.
However, the Andromeda Galaxy is blue shifted showing it is moving towards us.
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∙ 14y ago
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The spectra of most galaxies show redshifts this means that their spectral lines are what?
shifted towards the red end of the spectrum
In 1912 an astronomer at Arizona's Lowell Observatory noticed that the lines in the spectra of most galaxies shifted toward the red end of the spectrum Another American astronomer Edwin Hubble lat?
Galaxies are moving away from each other in a constantly expanding universe
The spectral lines of elements when observed in distant galaxies show a shift towards?
The red end of the spectrum.
What actors and actresses appeared in At the End of the Spectra - 2010?
The cast of At the End of the Spectra - 2010 includes: Nicole Kidman
A star whose spectral lines are shifted toward the red end of the spectrum?
In simplest terms, the shift of galactic spectral lines towards the red end of the spectrum would indicate simply that the galaxy in question is receding from the observer. This is an example of the Doppler effect, where the frequency is lowered (wavelengths become longer, and in this case energy of the photons is decreased) by the relative motion of the observer. The redshifting of galaxies in all directions became the primary evidence of an expanding universe (cosmological redshift). Because the expansion of the universe is fairly uniform in all directions, those galaxies that are most distant are receding the fastest and thus evidence the greatest amount of redshift. By contrast, if a characteristic spectral line of a galaxy or other object shifted towards the blue end of the spectrum (shorter wavelengths), it would be traveling towards the observer.
How can astronomers tell if a star is approaching or receding from earth?
The relative motion between the observer and wave source causes an apparent change in frequency which is known as Doppler Effect. On combination with identification of spectra, it can also be used to find if the start is moving away or towards the earth, When there is shift in lines of spectra towards the red end of visible spectrum the star is said to be travelling away from the earth.
What happens when two spiral galaxies collide with each other?
You tend to end up with irregular galaxies
What is the importance of the light red shift in determining the age and motion of stars?
Red shift is of virtually no importance in determining the age of stars within our galaxy or local group. But the red shift is crucial for measuring relative velocities of those stars with respect to us. Stars approaching us are blue shifted, such as the stars in the Andromeda Galaxy. We can also determine which direction the galaxy is spinning, as the light of stars one one side will be shifted less than the light of the stars in front, or on the other side. Starlight from galaxies well beyond our local group are uniformly shifted towards the infrared end of the visible spectrum, varying with the distance of those galaxies from us. The further away they are, the deeper red the light is from them, indicating the greater their recessional velocity. I cannot think how stellar age might correlate with red shift.
What is indicated by a shift of galaxy spectral line toward the red part of its spectrum?
In simplest terms, the shift of galactic spectral lines towards the red end of the spectrum would indicate simply that the galaxy in question is receding from the observer. This is an example of the Doppler effect, where the frequency is lowered (wavelengths become longer, and in this case energy of the photons is decreased) by the relative motion of the observer. The redshifting of galaxies in all directions became the primary evidence of an expanding universe (cosmological redshift). Because the expansion of the universe is fairly uniform in all directions, those galaxies that are most distant are receding the fastest and thus evidence the greatest amount of redshift. By contrast, if a characteristic spectral line of a galaxy or other object shifted towards the blue end of the spectrum (shorter wavelengths), it would be traveling towards the observer.
Why is the light reaching us from celestial objects shifted towards the red or blue end of the spectrum?
Due to something similar to the Doppler effect. A wave reaching us from an object travelling towards us will look shorter than the same wave from an object travelling away from us. In light shorter waves gets bluer end longer waves get redder.
How many milky way galaxies end on end to the edge of the universe?
If the milky way galaxy is 100,000 light years across and if the universe is 13 billion years old, you would have 130,000 milky way galaxies, end on end to the edge of the universe.
During the end of the middle ages power shifted from feudal lords to?
nobles
