terrestrial planets | KidzSearch. Family-friendly safe search for kids.

The terrestrial planets. From left to right: Mercury, Venus, Earth, and Mars

A terrestrial planet is mostly made of rock (silicate). Earth is the "original" terrestrial planet. When astronomers started understanding the kinds of planet they extended the term to include our nearest rocky neighbours: Mercury, Venus and Mars.

It is often said that they are similar to Earth. This is true of most of the structure and composition, but not the surface or the atmosphere. A terrestrial planet may be much hotter or colder than Earth, and may have much more or much less atmosphere.

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