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In actual sense, one can not use the knowledge about the physical structure, atmosphere and the geological activities that happen n earth to either prove or disapprove the theories about the presence of other planets. On research of whether other planets have a solar system, most these were found. However, none f these systems had any key similarities with those of the earth. In addition, there us no planet that has an orbit that has been seen to have any close similarities t planet earth. The physical sciences of the earth include astronomy, chemistry, physics, and finally the sciences of the earth.  However, the physical and chemical aspects of research in the fields of physics and chemistry regularly look non concrete to the inexperienced person or group of people. Astronomy is apprehensive with the theory of the outside planets and other bodies, the sciences and the study of the earth are dedicated to aspects that are both real and direct. The emphasis of study for the planet earth sciences and how dissimilar the characteristics are from other planets is under many questions that are not answered (Peter, 2012).

Theories about the existence of the other planets suggest that they usually stand alone due to their unique characteristics and hence cannot support life of any living thing. On the other hand, the planet earth in the universe is the only supporter of real life. The theories of the planets are different from the planet earth due to the fact that their boundaries are not always distinct visibly. In addition to the physical boundaries, these planets are intensely hot, excessively cold, very close to a star, or as well far. Bearing in mind that all planets are unfamiliar to the common person, it is thus complicated to have a final conclusion regarding anything about these deserted places using the physical, atmosphere and the geological explanation and comparison to the planet earth (Stephen, 2006).

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