Cosmic History

Cosmic history is the story of how the universe began and changed over time. Scientists believe it started with the Big Bang about 13.8 billion years ago. Since then, the universe has been expanding, and stars, galaxies and planets have slowly formed. Our own solar system is only about 4.6 billion years old.

Key Events in the Universe

• The Big Bang
• Formation of the first stars and galaxies
• Birth of our Solar System

Order of Cosmic Eras

1. The early universe (Big Bang and cooling)
2. The age of stars and galaxies
3. The formation of Earth and life

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