the first galaxies

Age/Redshift of the Universe

This figure shows a timeline of the universe, which relates the age of the universe to the redshift. Redshift is a quantity astronomers use to measure how much the light from distant galaxies has shifted towards redder wavelengths due to the expansion of the universe. Galaxies which emit light at very early times have very high redshifts. As a result of our detailed knowledge of how the universe expands, we are able to obtain an approximate relationship between the age of the universe and the redshift a galaxy would have if it emitted light at that time.

Credit:Rychard Bouwens

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