One of the most important theories about the beginning of the universe is the big-bang theory. The big-bang theory explains the formation of heavenly bodies such as galaxies, stars, and planets and many more.
According to the big-bang theory, all the matter in the universe was originally concentrated in one vast lump called primeval atom which was 100 million light years wide. This super dense and extremely hot primeval atom exploded with a big bang. This primeval atom was a concentrate of neutrons and protons. The big bang explosion caused the matter flying in all directions through space leading to the formation of galaxies, stars and other heavenly bodies. The big bang theory suggests that the universe has a definite age and a definite size. The astronomers have estimated that the universe was formed about 15 billion years ago. The big bang has caused the expansion of universe. The expansion is due to the energy generated by the big bang.
The scientists and astronomers estimate that the speed of matter expansion would decrease as the matter has travelled from the explosion point. In due time ultimately the expansion will halt.
Big Crunch:
The big crunch is one in which the scenarios predicted by scientists say that the universe may end. When big crunch occurs, the entire universe will collapse under its own gravity and will again concentrate at one point as it was before big bang. The new study suggests that we are approaching the big crunch.
Many physicists estimate that the universe may end between 2.8 to 2.2 billion years from now. Another big bang will occur after big crunch.
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