Word: redshift
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Dates: during 1960-1969
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...shock. Astronomer Greenstein promptly shelved his own unpublished quasar theory, admitting that "if it weren't for Maarten, I could have been caught with my scientific trousers down." Instead, he turned to a spectrogram that he had taken from quasar 3C 48 and - using Schmidt's redshift key - discovered that 3C 48 was re ceding even faster than 3C 273. By Hubble's law it appeared to be some 4 billion light-years away...