Type Ia supernova distance measurements Dark matter

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type ia supernovae can used standard candles measure extragalactic distances, can in turn used measure how fast universe has expanded in past. data indicates universe expanding @ accelerating rate, cause of ascribed dark energy. since observations indicate universe flat, expect total energy density of in universe sum 1 (Ωtot ~ 1). measured dark energy density ΩΛ = ~0.690; observed ordinary matter energy density Ωm = ~0.0482 , energy density of radiation negligible. leaves missing Ωdm = ~0.258 nonetheless behaves matter (see technical definition section above) – dark matter.








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