Approximately what is the lower mass limit ($M_ ext{Sun}$) required for an object to sustain core hydrogen fusion and become a main-sequence star?
Answer
$0.08 M_ ext{Sun}$
The consensus boundary between brown dwarfs and main-sequence stars is approximately $0.08$ times the mass of the Sun ($M_ ext{Sun}$), which is the threshold needed to reach the required core temperature of about 10 million Kelvin.
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