What minimum mass ($ ext{M}_ ext{sun}$) is generally cited as the threshold for an object to be considered a main-sequence star capable of sustained hydrogen fusion?
Answer
Slightly above $0.08$ solar masses
The threshold defining a main-sequence star capable of fusing regular hydrogen ($ ext{hydrogen-1}$) in its core is generally cited as being slightly above $0.08$ solar masses ($ ext{M}_ ext{sun}$).
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