Early history of the universe

According to the Standard Big Bang Model, the universe as we know it came into existence about 15 billion years ago. Since then, it has expanded and cooled. As its properties have changed over time, its consituents (from elementary particles to atoms, stars and galaxies) have likewise changed.

The very earliest times include the era when the forces were unified according to the Grand Unified Theories, or GUTs, one of which is the theory of Inflation.

Some interesting links

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