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Since mass can be determined by the brightness, if the brightness is lower than previously thought, shouldn't it be that the mass is also higher than previously thought? If the brightness was thought to be 40% and mass 50 but brightness is actually 20, wouldn't the mass also be less than 50, hence lower than previously thought?
I'm not sure I understand this question - what does 60 times less light mean? Is that supposed to be an absolute number? It seems pretty relative to me.