Hemispherical von Neumann Bolometric Space Antenna of radius r=1.5m receives total of 1.5 x10- W of radiative power across the whole EM spectrum when directed at the distant B-type star (at distance D=11 lightyears). Given that the radius of the star is known (from independent measurement) to be Rstar = 500,000km, find the star surface temperature. NOTE: Light year -- astronomical distance corresponding to the distance that light travels in on year. Take: a year to be 365.25 days, the speed of light to be c=3x108m/s; Stefan Boltzmann Constant to be o = 5.670*10-8 W/m2k4 State your answer to the nearest Kelvin. NOTE: hemisphere is half of the sphere