| Planet | Interior Structure | Surface Features | Temperature | Atmosphere Composition | Atmospheric Pressure (bars) | Magnetic Field |
| Mercury | Not known if liquid or solid | Craters, scarps, plains | 700 K (day), 100 K (night) | None | --- | Very weak |
| Venus | Probably partly liquid | Volcanos, plains, craters | 750 K | CO2, N2 | 92 | None detected |
| Earth | Solid inner core, liquid outer core | Few craters, large continents, organized volcanism, erosion | 200-315 K | N2, O2 | 1.013 | Strong, well organized |
| The Moon | Solid core | Mare, craters | 400 K (day), 100 K (night) | None | --- | Very weak |
| Mars | Probably solid core | Craters, volcanos (dead), erosion features | 160-280 K | CO2, N2 | 0.007 | Weak, localized |