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2 bytes added ,  20:30, January 6, 2009
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The key fact is that the matter density anywhere in the universe is ''also'' a function of redshift. In the simple case of "flat" space,
 
The key fact is that the matter density anywhere in the universe is ''also'' a function of redshift. In the simple case of "flat" space,
   −
<math>\Omega = \Omega_m(1+z)^3</math>
+
<math>\,\Omega = \Omega_m(1+z)^3</math>
    
where <math>\Omega_m</math> is the weighted-average mass-energy density of the universe in the present [[epoch]].
 
where <math>\Omega_m</math> is the weighted-average mass-energy density of the universe in the present [[epoch]].
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