The planets lie in nearly the same plane. Most of the mass of the solar system is in the Sun. There are two types of planets in our solar system. The fact that the planets lie in nearly the same plane is unrelated to the rotation of the solar nebula. The age of the universe cannot be determined.
Jovian planets are far from the Sun.
Jovian planets have long days. Jovian planets have high masses. The composition of terrestrial planets is typical of the rest of the universe. True b. False 12. Much of the hydrogen and helium in the inner solar system ended up at the center, in the Sun.