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Formation of the Universe
Transcript of Formation of the Universe
To understand how the universe formed, scientists study the movements of galaxies.
Theories about the beginning and end of the universe must be tested by observations or experiments. The theory that the universe began with a huge explosion. It is a model that explains why the universe is expanding.
According to the theory:
1. All the contents of the universe were originallly squeezed into a very small volume.
2. Contents were at extremely high pressure and temperature.
3. 14 billion years ago, this small volume rapidly expanded and cooled. 1. The expansion of the universe.
2. Cosmic background radiation-Scientists using radio telescopes to pick up radiation noticed background "noise" coming from all direction in space, and they believe this is energy left over from the big bang. Every object in the universe is a part of a larger system:
A planet is part of a planetary system
A planetary system is part of a galaxy
A galaxy is part of a galaxy cluster
Earth is part of the planetary system called the solar system. Our solar system is part of the Milky Way galaxy. Scientists can estimate the age of the universe by studying the oldest stars in the Milky Way galaxy which are known as white dwarfs.
Oldest white dwarfs are between 12 billion and 13 billion yrs. old, therefore, scientists think the universe is about 14 billion yrs. old. http://www.brainpop.com/science/space/bigbang/ The Big Bang Theory