1. How can Neptune have more mass than Uranus but a smaller diameter? Hint: See Table 5-2. 2. How would a planet orbiting one of the first-generation stars be different than planets formed today? What...

1. How can Neptune have more mass than Uranus but a smaller diameter? Hint: See Table 5-2.

2. How would a planet orbiting one of the first-generation stars be different than planets formed today? What chemical elements would that planet contain? Could we humans exist on that world? Why or why not?