Universe is commonly defined as the totality of everything that exists including space, time, stars, planets and beyond. It is made up almost of hydrogen and helium. These are the two lightest elements. All the rest of the matter is very rare. The Universe is held together by forces.
How did the universe originated? Was there any theories about this? Based on my researches, studies and discussions since then, there were theories that explain the appearance of everything from nothing.
The Big Bang Theory. What was the Big Bang? The Big Bang is the most popular theory about the creation of the Universe. According to it, the whole universe was created in a split second in one huge explosion. All matter was squeezed together into a tiny, super-hot, dense ball that was smaller than an atom. The ball gradually expanded as it cooled, then exploded, releasing energy and matter in all directions. We cannot see the Big Bang because it would have happened billions of years ago. But we can see that the universe is growing bigger.
The Big Bounce Theory. This is a theory about the formation of the universe. This is a bit the same with the Big Bang. It suggests that another universe went through a Big Crunch and then 'bounced' back and gave birth to this universe (Scientific American).
Steady State Theory. This is developed by Fred Hoyle and Thomas Gold in 1949. This theory had no beginning but it created new matter as older galaxies moved apart. The advantage of this theory is that its simple explanation.
These were the answers of the questions How did the Universe begin, and when? How has it evolved? How will it end, and when?
No comments:
Post a Comment