The Habitable Zone outside Earth

These planets obey most of the expectation that a planet may act on behalf. Gilese 667Cc is declared the most earth-like planet outside the solar system, and is even more like Kepler-22b (Wedemeyer-Bohm "Gilese 667Cc"). The main stars are GJ 667 Cc, HZ distance is .11 to .23 AU. Fortunately, Gilese 667Cc is in .12 AU and is in HZ (Wedemeyer-Bohm "Gilese 667Cc"). If the earth lives in Gilese 667 Cc, the earth will freeze, but compared to our sun, GJ 667 Cc is a much smaller star.

On the Earth, it has been confirmed that there are possibilities of survival conditions that some complex multicellular organisms (or eukaryotes) may exist outside conservative residential areas. Geothermal energy maintains an ancient ecological system and supports large and complex creatures like Riftia pachyptila. A similar environment may exist in the ocean under the solid crust, as in the waters of Europa and Enceladus outside the living area. Many microorganisms including eukaryotes are tested under simulated conditions and low earth orbit. An example of an animal is Malginus tardigradum, which can withstand the boiling point of water and extreme temperatures of cold vacuum well beyond outer space. Fungi Cryomyces antarcticus and Cryomyces minteri can also survive and propagate under conditions similar to Mars.

Residential areas, orbital areas around stars, planets on the earth can have liquid water on their surface and can support life. Since liquid water is essential to all life on earth, the definition of the area that can live is based on the assumption that extraterrestrial life shares this requirement. This is a very conservative (but observable) definition. Because the surface temperature of the planet is not only close to a fixed star, but also it depends on its atmospheric greenhouse gas, its reflectivity, and the atmospheric or oceanic circulation. In addition, internal energy sources such as radioactive decay and tidal heating can warm the surface of the earth to the melting point of water. Because these energy sources also maintain groundwater reservoirs, planets can contain life even if they are not in the area where those stars can live.