Suppose the Hubble Space Telescope discovers a series of planets with the following characteristics moving around a star that resembles our Sun: spherical, solid surfaces; mean densities about four times that of water; radii about 4000 km; low-density atmospheres. How would these planets be classified in comparison with our solar system?
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Terrestrial planets refers to those four planets that are nearest to the sun and that lies within the asteroid belt. These planets are mainly composed of rocks or other metal objects that have a hard and resistant surface on it. They have a metal core that is molten (liquid) in nature, and atmosphere is relatively less dense, and also various geological features are present on it like the crater, volcanoes which can be observed with the help of satellites. The average densities of these planets is about four times the density of water. For example, the density of water is 1 g/cm³, whereas the density of earth is 5.5 g/cm³.
Thus, the correct answer is option (D).