The luminosity of the Sun is 4*10^33 ergs/s, and its distance to the Earth is 1.5*10^13 cm.
You are tasked with building a solar power plant in the Arizona desert, using solar panels with 10% efficiency. How large an area (km^2) must your solar panels cover to match the power output of a large nuclear powerplant (about a Gigawatt)? Please enter your answer in units of km^2.