You observe a nova in another galaxy. Soon after the eruption (3 days), when you expect the expanding shell to still be optically thick, you decide to determine the distance to the nova. You obtain spectroscopic measurements with a bolometric flux of 9 x 10 10 erg cm 2 s that indicate an expanding photosphere with T = 104 K and v = 3 x 10 km s . What is the distance to the nova in kiloparsecs