A group of scientists published in the Astrobiology journal the article, which first prompted to enter a special rating of exoplanets, which perhaps the existence of life. Rating planets expected to be based on assessments of two indices: the index of similarity between the planets to the Earth (Earth Similarity Index-ESI) and the index of the population of planets (Planetary Habitability Index - PHI). Earth Similarity Index-ESI is calculated on the basis of the similarity parameters of the planets with the Earth-it take into account by a comparison of the mass, size, density, distance from the star of each particular planet with the corresponding parameters of the Earth. According to Dirk Schulze-Makuch from the University of Washington, in the presence of extrasolar planets parameters similar to the parameters of the Earth - is a necessary condition for the existence of life on this planet. Planetary Habitability Index - PHI is calculated on the presence of extrasolar planets have all the necessary conditions for life: liquid water on the surface, the surface of a suitable temperature, magnetic field, atmosphere, containing the necessary amount of oxygen, etc. Scientists have calculated that the maximum rating of -1.00 - received the Earth, exoplanet Gliese 581g - 0,89, exoplanet Gliese 581d-0, 74.