It seems reasonable to conclude that solar systems may be a natural formation and that terrestrial planets are a result of the formation of population two stars. If stars are between spectral class F2 and M2 they seem to be suitable incubators for earth-like planets. Binary systems are also suitable for stable orbits if the stars within these systems do not have elliptical orbits and the terrestrial planet is orbiting at an appropriate geographic location either away from or between both stars. If a terrestrial planet is large enough, it can obtain by the mechanisms of volcanism a secondary atmosphere of carbon dioxide. In order to develop into a truly earth-like planet, development of tertiary atmosphere of oxygen is necessary to support the biological process known as photosynthesis. And therefore create an ecology on the planet. The question that now arises, given the right geography, conditions and the appropriate amount of time, is life inevitable?