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About And Anatomy Of The Universe

The universe contains everything that exists,  from the tiniest subatomic particles to galactic super-clusters (the largest structures known).  Nobody knows how big the Universe is,  but astronomers estimate that it contains about 100 billion galaxies,  each comprising an average of 100 billion stars.  The most widely accepted theory about the origin of the Universe is the BiG Bang theory,  which states that the universe came into being in a huge explosion – the Big Bang – that took place between 10 and 20 billion years ago.   The universe initially consisted of a very hot,  dense fireball of expanding,  cooling gas.  After about one million years,  the gas probably began to condense into localized clumps called protogalaxies.  During the next five billion years,  the protogalaxies continued condensing,  forming galaxies in which stars were being born.  Today,  billion of years later,  the universe as a whole is still expanding,  although there are localized areas in which objects are held together by gravity ; for example,  many galaxies are found in clusters.  The Big Bang theory is supported by the discovery of faint,  cool background radiation coming evently from all directions.  This radiation is believed to be the remnant of the radiation produced by the Big Bang.  Small “ripples” in the temperature of the cosmic background radiation are thought to be evidence of slight fluctuations in the density of the early Universe , which resulted in the formation of galaxies.  Astronomers do not yet know if the Universe is “closed” , which means it will continue expanding forever.

We also live in a Galaxy . I mean Earth , The sun , Moon etc. are in one Galaxy . That is The Milky Way .

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