Why can we not have a white dwarf of 2 M ? ?
A) Even the largest main-sequence stars always lose enough mass so that they reduce to 1.4 M ? after they form a planetary nebula.
B) A white dwarf of more than 1.4 M ? could not be supported by electron degeneracy.
C) When a star reaches the white dwarf stage with more than 1.4 M ? , the intensity of nuclear radiation in its core makes it explode.
D) A white dwarf is like a giant nucleus; if it has a mass of more than 1.4 M ? , it fissions into two parts like an unstable nucleus.
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