It was meant to be 6×10^6 -- as a quick soundness check, the sun's radius is significantly more than 75 km (636 / 8.5) -- though I agree it would probably have

It was meant to be 6×10^6 -- as a quick soundness check, the sun's radius is significantly more than 75 km (636 / 8.5) -- though I agree it would probably have been more reasonable to just write "6 million km"