The luminosity of the Milky Way Galaxy is about ten billion times the luminosity of the Sun.During peak periods of brightness,the quasar 3C 279 has a luminosity about ten thousand times the luminosity of our Galaxy.Suppose the flux (energy per second per emitting area) from our Sun remains the same,but it grows in radius.How big would it have to be to produce the same luminosity as 3C 273 at its peak?
A) about the size of Pluto's orbit
B) about a hundred times the diameter of Pluto's orbit
C) about a light year across
D) about one-tenth the diameter of the Galaxy
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