A terrestrial planet, telluric planet or rocky planet is a
planet that is primarily composed of
silicate rocks. The term is derived from the
Latin word for
Earth, "Terra", so an alternative definition would be that these are planets which are, in some notable fashion, "Earth-like". Terrestrial planets are substantially different from
gas giants, which might not have solid surfaces and are composed mostly of some combination of
hydrogen,
helium, and
water existing in various
physical states.
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One of four rocky planets found within the inner solar system. They are
Mercury,
Venus, Earth and
Mars. They are distinguished from the gas giants by their smaller diameters, higher densities and tenuous atmospheres.
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