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In the definition of science , Universe is the place of existence of all the physical laws . Anything like matter, force , energy and time all exist within this place. The concept of Universe's shape, creation and working is under much conjecture and speculation and can never(as deemed by many scientists) be fully researched in the lifetime of the mankind's existence.

HistoryEdit

Many ancient civilisations have mentioned the word universe in their known and found anecdotes and literary pieces. As in Vedic cultures, the timeline of whole Universe is given which is more similar to modern timeline of Universe than any other. It is evident from the fact that many Vedic scientists dedicated their time thinking and speculating upon the Universe's creation. They first found the creation of Universe to be the appropriate topic to discuss first; unfortunately, they could only speculate on creation rather than physics of it. The Universe's limits in our minds have broadened out from just milky way, in 1900s, to Many group of galaxies, in 1920s.

Origin Edit

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Modern TheoryEdit

Modern concept of Universe 's creation came in the mid-twentieth century, when many scientists dedicated themselves to Cosmology and started exploring the universe's realms through telescopes. Many scientists gave their theories on birth of Universe. Big Bang is the currently accepted theory. In big bang, the universe started out in an explosion of a very dense and hot ball of matter in voidness. This explosion was called as Big Bang.

How big is the Universe? Edit

Throughout history, humans have used a variety of techniques and methods to help them answer the questions 'How far?' and 'How big?' Generations of explorers have looked deeper and deeper into the vast expanse of the universe. And the journey continues today, as new methods are used, and new discoveries are made. 

The size of the Universe is unknown; it may be infinite. The region visible from Earth (the observable universe) is a sphere with a radius of about 46 billion light years, based on where the expansion of space has taken the most distant objects observed.

Expanding Universe Edit

Expandinguniverse

In the 1920s, Edwin Hubble used the 100" telescope (2.5 meters) at the Mount Wilson Observatory in California to detect variable stars in nebulae. He discovered that the stars he observed had the same characteristic variations in their brightness as a class of stars called Cepheid Variables. Earlier, astronomer Henrietta Levitt had shown there was a precise correlation between the periodic change in brightness of a Cepheid Variable and its luminosity. Hubble was able use this correlation to show that the nebulae containing the variable stars he observed were not within our own Galaxy; they were in external galaxies far beyond the edge of our Milky Way. Hubble determined the distances to the galaxies and the velocities that they were moving at, relative to Earth. From this, he discovered an amazing thing: the farther galaxies were away from us, the faster they were moving away from us. In other words, the Universe was expanding.

Age of Universe Edit

According to research, the universe is approximately 13.8 billion years old. Scientists can determine the age of the universe using two different methods: by studying the oldest objects within the universe and measuring how fast it is expanding. 

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