Anatomy of the Uunierse
THE UNIVERSE CONTAINS EVERYTHING that exists, from the tiniest subatomic particles to galactic superclusters ( the largest structures known ).
Nobody knows how big the Universe
is, but astronomers estimate that it contains at last 125 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 Big Bang theory is supported by the discovery of faint, cool background radiation coming evenly 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 comic 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 eventually stop expanding and begin to contract, or if it is "open", which means it will continue expanding forever.
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