New model challenges idea that Pluto started out frozen Surface images used to test “cold start” vs. “hot start” ideas. Scott K. Johnson – Jun 22, 2020 1:00 PM | 73 Credit: NASA/APL/SRI ...

But Pluto’s stupefying distance from the sun complicated things. To fit it in, even at 1:5 billion scale, Brown had to extend the model solar system another 670 feet into the commercial district ...