1. Scientific Theories and Laws
2. The First Decade (1936-1946)
4. The Second Decade (1946-1956)
6. The Third Decade (1956-1966)
8. The Fourth Decade (1966-1976)
10. The Fifth Decade (1976-1986)
12. The Sixth Decade (1986-1996)
14. The Seventh Decade (1996-2006)
15. The Theory of More than Everything
16. The Eighth Decade (2006-2016)
18. The Ninth Decade (2016-2026)
Appendix A Paintings
Appendix B TTOMTE and a Steady State Universe
Appendix C Musical Compositions
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The above description accounts pretty well for what the universe looks like today. About the temperature of the universe: we may have implied that scientists knew the temperature of the universe was 30 K before they proposed the Big Bang theory. Actually, the Big Bang theory predicted background radiation in the 1940's. Astronomers discovered the radiation in 1965, and with that kind of evidence, they put the theory of the Big Bang in the trophy case as the best model of the universe.
The answer depends on the amount of matter and how fast it's flying apart. If the universe expands faster than gravity can pull it back together, it will explode outwards forever. All the material might run into a wall out there, but not likely. In this scenario, the universe came in with a bang and will go out with a whimper (kind of sad).
If gravity is strong enough to overcome the expansion, galaxies will slow down, stop in their tracks, and start falling. Look out below, wherever below is. Everything will come crashing back together, perhaps one hundred billion years from now, into another singularity to explode all over again. This pumping action might have occurred hundreds of times already; scientific thought is leaning in this direction. Maybe we should have called this theory The Big Rebound just to be safe.
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