f a terrestrial planet in the Solar System.
                        </description>
                    </planet>
                    <planet>
                        <name>Mars</name>
                        <description>
                            Mars (1.5 AU) is smaller than Earth and Venus (0.107 Earth masses). It possesses an
                            atmosphere of mostly carbon dioxide with a surface pressure of 6.1 millibars (roughly 0.6
                            percent that of the Earth's).[43