Final answer:
Both terrestrial and Jovian planets formed from the same solar nebula, sharing a common origin, which results in a baseline of materials and a layered structure of denser materials at the core.
Step-by-step explanation:
A characteristic shared by both the terrestrial and the Jovian planets in our solar system is that they all formed from the same solar nebula, also referred to as the "mother cloud." This origin implies that there is a common baseline of materials from which both types of planets were constructed, despite the significant differences in their current compositions and physical characteristics. The terrestrial planets, including planets like Earth and Mars, are primarily composed of rocks and metals, while the Jovian planets, such as Jupiter and Saturn, are made up mainly of gases like hydrogen and helium. Despite these differences, the underlying similarity in origin is marked by their motion around the Sun and certain aspects of their structure, such as having a layered construction with denser materials closer to the core.