• Introduction and Review

  • History of the Universe

    1. 13.8 billion years ago the Big Bang occurred
    2. After that, for 400,000 years the temperature of the universe was very high. So high that particles couldn’t even bond to form
    3. As the universe cooled, protons and neutrons began to form into a nuclease
    4. When the universe got even colder, electrons began to orbit the nuclease; forming the first atoms
    5. Eventually, one of these atoms — Hydrogen formed the first molecule(H2). This happened because Hydrogen is very unstable on its own.
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