Inner Planets Diagram
The terrestrial planets are the four innermost planets in the solar system: Mercury, Venus, Earth, and Mars. They are called terrestrial because they have a compact, rocky surface like the Earth's. The planets Venus, Earth, and Mars have significant atmospheres, while Mercury has almost none. This diagram shows the approximate distances of the terrestrial planets from the Sun.
Image Credit: Lunar and Planetary Institute
Credit: Lunar and Planetary Institute