Iâve come up with fewer reasons for giving a child a cell phone earlier, but at least two of them are enough to offset a multitude of others. Keeping tabs on them. As each year passes in a childâs life they venture farther from home and for longer periods of time.
Like the inner planets, the outer planets have similar characteristics to one another. The outer planets are so much larger than the inner planets that they make up 99 percent of the mass of the celestial bodies that orbit the Sun. Although mainly composed of gas, the outer planets also have other ingredients.
1 The inner planets are made up mainly of dense, solid rock. 2  The outer planets are composed primarily of gas, so their overall density is lower. 3  However, they are larger in size and much more massive! 4  Saturn is massive and second in size to Jupiter, but its density is so low that it would float in water!