What is the approximate hard upper limit for the mass of a stable white dwarf?

Answer

1.4 times the mass of the Sun ($1.4 M_{\odot}$)

The upper limit for electron degeneracy pressure to counteract gravity is defined by the Chandrasekhar Limit, which is approximately $1.4 M_{\odot}$.

What is the approximate hard upper limit for the mass of a stable white dwarf?

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