What core temperature must a Sun-like object reach to ignite sustained hydrogen fusion and become a Main Sequence star?
Answer
Approximately 10 million Kelvin ($10^7$ K)
The transition from a protostar to a true star occurs when the core temperature and density are high enough to initiate sustained, self-sustaining hydrogen fusion, which requires a temperature threshold of about 10 million Kelvin for solar-mass stars.
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