why do inner planets consist mostly of rock and metal but the outer planets mostly of gas
The inner planets consist mostly of rock and metal because as the planets are formed, and the sun began to shine, solar wind blew out light, gaseous elements such as hydrogen and helium out of the inner portion of the solar system leaving the inner planets free of the elements.he four inner, rocky planets are also known as the terrestrial planets. These are; Mercury, Venus, Earth and Mars. The four outer, or gas planets; Jupiter, Saturn, Uranus and â¦ Neptune.