The outer planets are very large, making up 99 percent of the mass of the bodies orbiting the sun.

True.

Explanation:

The inner planets mercury, Venus, Earth and mars are considered as the smaller planets in terms of their masses. These are composed of metals and rocky material. The outer four planets are known as giant planets as they are more massive then the inner ones. The largest ones are Jupiter and Saturn mainly composed of hydrogen and helium gases. The outer most Uranus and Neptune contains the substances with the high melting points. So it's right to say that the outer planets are very large, making up 99 percent of the mass of the bodies orbiting the sun.

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