A critical study reveals that the previous explanations on planets of the Solar System need thorough scrutiny. Here, I have pointed out that all planets of the Solar System are basically composed of similar objects and no planet can be mainly constituted of gases. The study reveals that Earth is an expanded planet and matching thickness of its outer core with the extent of expansion reveals that due to expansion, the former geosphere has opened up as a void zone. The prevalent concept conceives that the outer core is a fluid geosphere comprised of liquid iron. Here I envisage that because of occurrence of a void geosphere between the solid mantle and the solid inner core, in addition to the normal downward force of gravitation, a reversely directed gravitational force would be manifested in the Earth’s deep interior. Accordingly, temperature and pressure at the Earth’s deep interior would be sufficiently low, thereby, keeping the inner core a dipolar permanent magnet. Since all planets of the Solar System are similar in nature, the information gained here in regard to planet Earth can be applied for unravelling the features of all other planets of the Solar System as well.