Problem 1. The energy flux (brightness) of the closest start

Question Problem 1. The energy flux (brightness) of the closest start to the Sun (Alpha Centauri A) is approximately 2.7 · 10^-8 W/m2. Assuming that its luminosity is equal to the Sun’s luminosity estimate the distance to the Alpha Centauri in AU (the Solar brightness is 1400 W/m2) and in light years. Does it agree with the correct result (which you can find on Google)? Why?

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