类木行星为类似木星的气体行星，体积较其他岩质的行星来的大，包括木星，土星，天王星以及海王星等四个行星。然而，天王星和海王星有许多地方和木星与土星不同，有时只指木星和土星这种行星。
类地行星和类木行星之间最明显的区别是它们的大小。
The most obvious difference between the terrestrial and the Jovian planets is their size.
同样，由于它们的相对位置，四颗类木行星被称为外行星，而类地行星被称为内行星。
Also, because of their relative locations, the four Jovian planets are known as the outer planets, while the terrestrial planets are known as the inner planets.
类地行星的密度的平均值大约是水的密度的五倍，而类木行星的密度平均值只有水的密度的1.5倍。
The densities of the terrestrial planets average about 5 times the density of water, whereas the Jovian planets have densities that average only 1.5 times the density of water.
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