For the closest objects, we see both redshifts and blueshifts, corresponding to speeds ranging from a few hundred to a few thousand kilometers-per-second. What we find, when we do this, is something quite remarkable. When combined with the distance measurements of Hubble, this data gave rise to the initial idea of the expanding Universe: the farther away a galaxy is, the greater its light is redshifted. signatures of absorption or emission of particular atoms, ions, or molecules, but with a systematic shift towards either the red or blue end of the light spectrum. First noted by Vesto Slipher back in 1917, some of the objects we observe show the spectral.
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