If a galaxy shows lines red-shifted from 500nm to 505nm. How fast in the galaxy moving?
In order to calculate the redshift one has to know the wavelength of the emitted light in the rest frame of the source, in other words, the wavelength that would be measured by an observer located adjacent to and comoving with the source.
Answered
by Hannah M.
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About Galaxy
A galaxy is a group of billions and billions of stars clumped together by gravity. If our planet was a house, the solar system our town, our galaxy the Milky Way, would be our country.
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