The sun has been shining for 4.5 billion years, but it will be another 6 billion years before it’s fuel runs out… and the earth is vaporized. One thinking tendency is to imagine that humans will be there experiencing the sun’s demise. But any life and intelligence that exists then will be as different from us as we are from bacteria.”

From the TED 2007 talk by Sir Martin Rees, professor of cosmology and astrophysics at the University of Cambridge. This is a rather interesting perspective, given that whenever we talk of evolution, we think in terms of the millions of years over which it has taken shape and rarely in terms of the millions of years that lie ahead.