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This was confirmed when Adams measured this redshift in 1925.
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This device measured the redshift, or its light broadening to longer wavelengths, of EGS-zs8-1.
Because it is usually not known how luminous objects are, measuring the redshift is easier than more direct distance measurements, so redshift is sometimes in practice converted to a crude distance measurement using Hubble's law.
This was the first instance in which scientists were able to measure the redshift of a GRB.
The Sloan Digital Sky Survey (SDSS), is ongoing as of 2013 and aims to measure the redshifts of around 3 million objects.
The binary inspiral of GW170817 measured its distance; telescope observations of the accompanying gamma-ray burst measured its redshift.
Once the fading leveled off--suggesting that the light of the host galaxy was emerging--Kulkarni captured the galaxy's spectrum and measured its redshift.
For these we find a median redshift of z=1, but the measured redshift distribution has a deficit of objects with z∼2, when compared to predictions based on extrapolating luminosity functions constrained by higher-flux-density samples.
Precise measurements of this redshift give a value of −13.9 ± 0.9 km/s.
This was how the Pound-Rebka experiment (which was in the late 1950s and greatly less sophisticated) first measured the gravitational redshift phenomenon on Earth! 4 59 PM: This has an interesting consequence: if you want to compare the results from two clocks, you need them to be at the same location!
A spectroscopically measured redshift is basically the "gold standard" of distance measurements.
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