Secondly, there is a lot that can be done to drive down the size of the radiator. A heat pump can be used to radiate heat at much higher temperatures, thereby r

Secondly, there is a lot that can be done to drive down the size of the radiator. A heat pump can be used to radiate heat at much higher temperatures, thereby requiring a smaller radiator. Moreover, a metamaterial surface can be used to prevent self-absorption. On Earth, people like you keep sending the bill to the next generation. In space, the bill is due immediately. There is no real difference in the amount due.