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21/03/1927 American astronomer Halton Arp is born

He is known for challenging the theory that redshifts of quasars indicate their great distance. Quasars are considered to be farthest objects in the known universe because their light has increased wavelength (hence it looks redder). Arp and his colleagues proposed that there were inconsistencies in the redshift observations, which could mean that the Big Bang theory itself is not correct.

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