The Doppler redshift was discovered by Hippolyte Fizeau in 1848.
Doppler.
The first astronomer to discover that a galaxies red-shift was larger the further away it was was Edwin Hubble in the 1920s.The first scientist to describe red-shift in stars was actually Hippolyte Fizeau in 1848, though he was a physicist and not an astronomer.That light should be effected in this way was suspected by Christian Doppler (after whom "The Doppler Effect" is named) as early as 1842.
Christian Doppler, and Austrian Physcist .
a star is moving AWAY FROM EARTH
A blue shift is observed in the spectrum from an object approaching the observer whereas a red shift is observed for a receding object.
The Doppler effect.
Doppler.
The first astronomer to discover that a galaxies red-shift was larger the further away it was was Edwin Hubble in the 1920s.The first scientist to describe red-shift in stars was actually Hippolyte Fizeau in 1848, though he was a physicist and not an astronomer.That light should be effected in this way was suspected by Christian Doppler (after whom "The Doppler Effect" is named) as early as 1842.
a star is moving AWAY FROM EARTH
Christian Doppler, and Austrian Physcist .
A Doppler red-shift is a shift in recognizable features of a star's spectrum from the wavelengths where we know they belong toward longer wavelengths. Such a shift can be caused by the star's moving away from us, and that's how it's interpreted when astronomers see it. A Doppler blue-shift is a shift in recognizable features of a star's spectrum from the wavelengths where we know they belong toward shorter wavelengths. Such a shift can be caused by the star's moving toward us, and that's how it's interpreted when astronomers see it.
The Doppler Shift is a change in frequency due to the Doppler Effect.
A blue shift is observed in the spectrum from an object approaching the observer whereas a red shift is observed for a receding object.
That is called a red shift or a Doppler shift.
Actually, it wasn't the Doppler-effect that lead to the Big Bang theory, but the red-shift of remote galaxies. Although it was initially thought that this red-shift might be caused by a Doppler-effect, it is now understood that this red-shift is caused by the metric expansion of space itself.
One of the most reliable methods employed presently is using Hubbles Laws and Constant, utilizing the red shift. RED SHIFT A+LS (:
The change in frequency is caused by the Doppler Effect