The three main theories put forward to explain the origin and evolution of the universe are: The Big Bang Theory; The Steady State Theory; The Pulsating Theory ... library.thinkquest.org |
According to pulsating theory, it is possible that at a certain time, the expansion of the universe may be stopped by the gravitational pull and the may contract ... wiki.answers.com |
The oscillatory universe is a cosmological model originally derived by Alexander Friedman in 1922. It was investigated briefly by Einstein in 1930 and ... au.answers.yahoo.com |