Birth of our universe

Birth of our universe

Scientists believe that the universe was born in a huge fireball about 13.7 billion years ago.

This "Big Bang" was the beginning of everything: time and space, as well as the matter and energy in the Universe.

Inflation 

As instant it began, the newborn Universe was incredibly small and unimaginable hot and dense. Inside the fireball , energy was turned into matter and antimatter. Then it began to expand and cool. For a tiny fraction of a second the expansion was quite slow , but then the Universe shot outwards. It has been expanding steadily ever since , might even be speeding up. And it is still expanding.

This is the time line of our universe, in short all started with a "Big Bang"! During the first three minutes the the universe cold from being unbelievably hot to less than 1 million degrees Kelvin. In the same period, it expanded from an area billion times smaller than the size of an atom to the size of our milky way galaxy.

Matter and antimatter 

Immediately after the Big bang, huge amounts of of energy were turned into particles of matter and mirror images of matter called as antimatter. When the two types of matter meet, they destroy each other in a flash of radiation. Now the fact is that if equal amount of matter and antimatter were created then they would have wiped each other. However, everything we can see in the Universe is matter. The only explanation seems to be that, for some unknown reason, the Big bang created slightly more matter than antimatter.

It took hundreds of millions of years for stars, Galaxies and planets to start filling the universe. If the universe hadn't begun to cool, the atoms they are made from would never have formed.

The foggy Universe

Around 300,000 years passed before the first atoms started to form. This process began when the temperature of the universe dropped to about 3000 K. In this cooler Universe, protons and atomic nuclei were able to capture extremely tiny particle called electrons and become atoms . Until this point, the Universe was very foggy- light could not travel far because it was constantly bouncing off atomic particles. This fog is why we cannot see anything that was happening at that time- even with the most powerful telescopes.




It means when we see a star many millions of light years away exploding, called as supernova, it is the past of that star, as when the star explodes, that light wave we are seeing today was traveling from millions of years and reached us today. Hence it is the past of the universe we are seeing today with our huge telescopes. It means the stars we see today which are away, not the closer ones, may or may not be present actually as we are seeing the past light wave that shows the incident that has already occurred millions of years before the formation of our own earth. Really strange!

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