ศุภิสรา สุวรรณรัตน์
Origin of the Universe
The universe is believed to have originated about 15 billion years ago as a dense, hot globule of gas expanding rapidly outward. At that time, the universe contained nothing but hydrogen and a small amount of helium. There were no stars and no planets. The first stars probably began to form out of hydrogen when the universe was about100 million years old. This is how our Sun originated about 4.49 billion years ago.
In 1992, instruments aboard the Cosmic Background Explorer (COBE) satellite showed that 99.97 percent of the energy of the universe was released within the first year of its origin. This evidence seems to confirm the Big Bang theory, which holds that the universe originated from a single violent explosion (a big bang) of a very small amount of matter of extremely high density and temperature. Astronomers also theorize that 99% of the matter in the universe is invisible or dark matter, composed of some kind of matter that is difficult to detect.
Big Bang Theory
After the discovery of the expansion of the universe by Edwin Hubble made the idea that the universe is expanding at present will look like in the past. The concept is in line with our common sense. The universe is expanding at the direction of walking forward. So if you go back in time to the direction of the universe, it should be shrunk down. Until might be just a very small volume. Volume of the void
If we order the direction of time from the beginning to the present. The evolution of the universe, it should start from the very small volume of material is very crowded, but there suddenly burst out violently. Make a small volume it grew out of the universe, as in the present. Such theory tells us that the universe should be the starting point in the past, will evolve into the future with the growth of violent outburst. This concept is different from the theoretical model, steady state universe altogether.
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