HomeScienceTerrestrial Planets: Definition & Facts About the Inner Planets

Terrestrial Planets: Definition & Facts About the Inner Planets

Terrestrial planets are Earth-like planets made up of rocks or metals with a hard surface. Terrestrial planets also have a molten heavy-metal core, few moons and topological features such as valleys, volcanoes and craters. 

In our solar system, there are four terrestrial planets, which also happen to be the four closest to the sun: Mercury, Venus, Earth and Mars. 

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