There are several different kinds of redshift that we encounter in the universe. Those three are ‘gravitational’, ‘doppler‘ and ‘cosmological‘. Before looking at two examples, it is best to have a ...
Cosmological redshift depends upon a galaxy's distance. Credit: NASA/JPL-Caltech/R. Hurt (Caltech-IPAC) In 1929 Edwin Hubble published the first solid evidence that the universe is expanding. Drawing ...
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