The strongest piece of evidence that supports the Big Bang theory is the

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The detection of the cosmic microwave background radiation left over from the formation of the universe is the strongest evidence supporting the Big Bang theory. This radiation is considered to be the "echo" of the Big Bang, and its existence supports the idea of a hot, dense beginning to the universe that has since expanded and cooled over time. The other options (expansion of the universe, dark matter, finite lifetimes of stars) are also supportive of the Big Bang theory, but the detection of the cosmic microwave background radiation is considered the strongest evidence.

The Strongest Piece of Evidence That Supports the Big Bang