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Butcher-Oemler Effect.
hypothesis suggesting the cores of galaxy clusters at intermediate redshift contain a
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About Butcher-Oemler Effect
The Butcher–Oemler Effect is a scientific hypothesis suggesting the cores of galaxy clusters at intermediate redshift contain a larger fraction of blue galaxies than do the cores of low redshift clusters. The claim was first put forward by Harvey Butcher and Augustus Oemler in a 1978 Astrophysical Journal paper.
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