Question

Explain why the outer planets have a lower density than the inner planets.

Answer 1

outer planets are not close to the sun and inner planets are closer to the sun whichs gives them higher density

Answer 2

After the formation of the Sun at the center of our Solar System, the planets were formed from a protoplanetary disc. Whereas the terrestrial planets resulted from dust grains in the inner Solar System, planets in the outer Solar System accreted enough matter for their gravity to hold on to the nebula's leftover gas.