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A superhabitable planet is a hypothetical type of exoplanet that has more suitable conditions for the emergence and evolution of life than Earth. In recent years, many experts have criticized the criteria used in the search for extraterrestrial life. They think that Earth does not represent the optimal planetary habitability in various aspects such as the type of star it orbits, total area, proportion covered by oceans and average depth of these, intensity of its magnetic field, geological activity, surface temperature, etc. Therefore, there may be exoplanets in the universe that have better conditions for life, allowing easier evolution and longer timelines. An extensive report published in January 2014 in the journal ''Astrobiology'' entitled ''Superhabitable Worlds'', René Heller and John Armstrong, collects and analyzes many of the studies in the years preceding the issue. Investigations of these astrophysical possible to establish a profile for the superhabitables planets according to stellar type, mass and location in the planetary system, among other features. concluded that this kind of planets could be much more common than traditional Earth analogs. By mid-2015, no exoplanet has been confirmed to be a superhabitable planet. Depending on the atmospheric composition and mass of Kepler-442b, which are unknown, it could be a superhabitable planet considering its location in the habitable zone, type of star and estimated size. == Characteristics == Multiple criteria analysed in Heller and Armstrong's research conclude that a series of basic characteristics, approximate capacity, require Superhabitable exoplanets. From his studies, extracted the planets about 2 Earth masses and 1.3 Earth radii, will have an optimal size for plate tectonics. In addition, its mean mass greater gravitational attraction will occur, assuming an increase in the capture of gases during the planet's formation. It is therefore likely that they have a denser atmosphere that will offer greater concentration of oxygen and greenhouse gases, which in turn raise the average temperature to optimum levels for plant life-about 25℃. It may also influence the relief of the planetary object, making it more regular and decreasing the size of the ocean basins, which will improve the diversity of the most abundant aquatic life in shallow waters. Other factors to consider are the type of star. K-type stars are less massive and can genuinely have a longer lifespan than Sun-like stars, giving more time to life for evolution and a location near the center of the Habitable zone of the system for longer periods of time. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Superhabitable planet」の詳細全文を読む スポンサード リンク
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