By John Hartnett
I outline what redshifts are and how they are used as a distance measure in the Universe. The usual practice is to equate redshift to expansion of space then in an expanding universe the greater the redshift the greater the distance in the Universe. But can this be justified from laboratory experiments? How sure are we that the universe began in a big bang? Does it all come down to our interpretation of what redshifts are?
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