This essay is concerned with the comparison of Mars, Venus and the Jupiter satellite Europa in terms of terraforming. These have been chosen because they are the would-be candidates for terraforming in our solar system. To provide the reader with an objective point of view, general data is presented as well as atmospheric composition and surface features of each of the heavenly bodies. To each of the planet chapters we added an overview of the missions that started to explore the specific bodies. In the same way, we listed the proposed terraforming methods. These are the results of our scientific research that enabled us to draw our conclusion. We hope to enrich your knowledge of the solar system and to give aid for your own scientific work and opinion.