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Star formation question
Possibly a silly question that hopefully some of the smart folks on here can answer. If a protostar/brown dwarf gains enough mass to initiate nuclear fusion in its core and become a star, how long does it take for the “starness” to become apparent? Given that it can take 100,000 years for a newly-minted photon to travel from the core of a star to the surface, would that then imply that a star might take 100,000 years to visibly “switch on” after nuclear fusion has commenced?
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