Standard-candle supernovae are still standard, but why?

Scientists believed that Type Ia supernovae, the best cosmological standard candles, are similar in brightness because they suffer thermonuclear explosions when the white dwarf stars that are their progenitors reach 1.4 solar masses, the Chandrasekhar mass. Now astronomers have shown that white dwarfs exploding as Type Ia supernovae have a range of masses. Their light-curve widths are directly proportional to the mass involved in the explosion.

from Space & Time News — ScienceDaily

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