What happened in the first second?
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The case for the Big Bang, the evidence behind it, and the parts cosmology is still arguing about.
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The evidence
Still debated
Your claim, not verified
The universe began in a hot, dense state about 13.8 billion years ago and has been expanding ever since.
Theory
The Big Bang
Proven
The Expansion of the Universe
Proven
The Cosmic Microwave Background
Proven
The Age of the Universe
Hypothesis
Cosmic Inflation
Theory
Dark Matter: The Leading Theoretical Framework for Missing Mass in the Universe
Contested
Dark Energy
Contested
How the Universe Will End
Contested
The Multiverse
Question
What, if anything, came before the hot, dense beginning?