Posthuman Blues

"Either we are alone or we are not. Either possibility is fascinating." --Arthur C. Clarke

Few Planets Will Have Time to Form Complex Life

"Since four billion years is almost half the anticipated life-time of our sun, life on other planets orbiting short-lived suns may not have had sufficient time to evolve into complex forms. This is because levels of oxygen will not have had time to develop sufficiently to support complex life, before the sun dies. Professor Catling said: 'This is a major limiting factor for the evolution of life on otherwise potentially habitable planets.'"