Analyzing the spectrum of a distant galaxy, you discover evidence that a type la supernova is occurring in that galaxy. A type la supernova has a peak luminosity of about 10 solar luminosities (1 solar luminosity = 3.8e26 Watts). Looking at an image of the galaxy, you estima your telescope only sees a brightness of 6.90E-15 Watts/m². Using this information and the brightness equation, how distant is the galaxy in which the supernova is occurring? Give your answer in It yrs. ly

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