The inner planets of the Solar System are called terrestrial because they are composed of rocky material and have solid surfaces, unlike the outer planets which are composed of gas and have no solid surfaces.
The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth's terra firma.
My (Mercury) Very (Venus) Easy (Earth) Method (Mars) Just (Jupiter) Speeds (Saturn) Up (Uranus) Nothing (Neptune).
