Big Bang Theory
The Big Bang Theory
The Big Bang Theory is the important explanation about how
the universe began. At its simplest, it talks about the universe as we know it
starting with a small individuality, then inflating over the next 13.8 billion
years to the cosmos that we know today. The name Big Bang Theory, is an inaccurate
description of what really happened. The universe did not start from a sudden explosion
but was a slow expansion from a single point.
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What is it?
The universe began as very hot, small, and dense, with no
stars, atoms, form, or structure. Then about 14 billion years ago, space
expanded very quickly, resulting in the formation of atoms, which eventually
led to the creation of stars and galaxies. The universe is still expanding
today, but getting colder as well. As a whole, space is growing and the
temperature is falling as time passes. Scientists that study cosmology agree
the Big Bang theory matches what they have observed so far.
Scientists base the Big Bang theory on many different observations. The most important is the redshift of very far away galaxies. Redshift is the Doppler Effect occurring in light. The more redshift there is, the faster the object is moving away. By measuring the redshift, scientists proved that the universe is expanding and can even work out how fast the object is moving. Because most things become colder as they expand, the universe is assumed to have been very hot when it started.
Scientists base the Big Bang theory on many different observations. The most important is the redshift of very far away galaxies. Redshift is the Doppler Effect occurring in light. The more redshift there is, the faster the object is moving away. By measuring the redshift, scientists proved that the universe is expanding and can even work out how fast the object is moving. Because most things become colder as they expand, the universe is assumed to have been very hot when it started.