Thursday, July 29, 2010

Dark matter and the far future



Theories of the big bang and the existence of the ripples in the back ground radiation suggest that the matter in the universe is greatly the dark matter. With in the dark matter the universe may be only a thin froth on the ocean of the matter.
If the amount of matter in the universe consists only of what we can observe place the dark matter, then the gravitational force is not enough to reverse the expansion of the universe. The clusters of galaxies will recede ever further apart and fade from each other's view. Black holes at the centers of the galaxies will grow, swallowing some of the matter in each galaxy, while the rest will disperse into intergalactic space. The last stars will be born a trillion year from now.  After 100 trillion years, even the longest lived stars, the low mass red dwarfs, will have faded. After 10 19   years, most dead stars and other matters in galaxies will have dispersed while the remainder will have been swallowed up by black holes. After 10 117 years, even black holes will have evaporated into radiation, and the universe will consists of a featureless enormously diluted sea of light weight particles and low energy radiation