The microwave remains of the Big Bang can be found in the cosmic microwave background (CMB), but the CMB only goes back to around 380,000 years after the universe was born. What happened before then has been somewhat figured out through physics, but those earliest moments still elude us, which is why weak force and neutron decay might finally bright them to light. The problem is that neutrons (which are relatively stable inside an atomic nucleus) decay rapidly, and various types of measurements have come up with varying answers.
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