At the Earth's twin, there is something Gliese (Video)

Recently discovered a huge number of planets outside our solar system that could theoretically have all the necessary conditions for the existence of life. One of them - Gliese 581g - is incredibly similar to Earth in many ways. The presence of the atmosphere, liquid water and a stable landscape make it an ideal refuge for aliens. ...

Scientists from the University of California, together with colleagues from the Carnegie Institution of Washington than 11 years dedicated to the study of planetary systems similar to our. Data were collected by means of two ten- telescope Keck Observatory in Hawaii. After that, all discovered planets were considered in terms of several parameters, which suggested that experts from NASA and the project to search for extraterrestrial intelligence SETI.

They identified two factors - the similarity with the Earth and the habitability. Depending on the severity of a number of attributes, each exoplanet, or a satellite received a numerical coefficient. Thus, the coefficient of similarity with the Earth (Earth Similarity Index) based on indicators such as mass, radius, temperature and degree of distance from the parent star. A measure of habitability (Planetary Habitability Index) is calculated based on surface characteristics, the availability of energy, the chemical composition of the medium and the possibility of the world contain a liquid.