Cosmology and space

On a very long time and distance scale, the ultimate fate of the universe is generally felt by scientists to be one that precludes the indefinite continuation of life. There are a broad spectrum of these predictive theories that fall in the realm of cosmology, but a long-established and widely-accepted notion is the Heat death of the universe. Most notions involve time periods much greater than the generally accepted age of the universe of around 13 billion years.