1.We have heard of simple toy models of the Universe that were studied by Einstein, de Sitter, and Friedman. If our Universe was 100,000 times denser than it actually is, what fate would the toy-model predict, a Big Crunch, Eternal Expansion, or a Big Rip? Why?
2. In the question above, would the universe have a finite size
Expansion of the Universe and Big Bang Theory
1) Does the fact that the entire galaxy was involved in bringing forth life on Earth change your perspective of Earth or life in any way? Explain. (Take the stance that my belief in extra terrestrial life in the universe is increased.)
5.9 Two equal quantities of water, of mass m and at temperatures T1, and T2, are adiabatically mixed together, the pressure remaining constant. Show that the entropy change of the universe is
[see the attachment for the equation]
where c_p, is the specific heat of water at constant pressure. Show that [delta]S >= 0. (Hint: (a
Using the physical conditions present in the universe during the era of recombination (T=3000 and pm=10^-18 kg/m^3), show by calculation that the Jeans length for the universe at that time was about 100 ly and that the total mass contained in a sphere with this diameter was about 4x10^5 Msun.
One hundred years ago, many scientists believed that the universe was infinite and eternal, with no beginning and no end. When Einstein first developed his general theory of relativity, he found it predicted that the universe should be either expanding or contracting. He believed so strongly in an eternal and unchan