Ia超新星爆发时辐射的能量几乎相等，因而具有几乎相同的本征亮度。
Type Ia supernovae all explode with nearly the same amount of energy and therefore have almost the same intrinsic brightness.
这些超新星有着一致的本征亮度，因此测出它们的视亮度，天文学家就知道它们离我们有多远。
The supernovae glow with the same intrinsic brightness, so by measuring how bright they appear on the sky, astronomers can tell how far away they are.
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