Why do some stars become white dwarfs instead of neutron stars or black holes?
Quick Answer
A star’s final fate depends mainly on its mass. Stars like the Sun shed their outer layers and leave behind a white dwarf, while much heavier stars collapse further into neutron stars or black holes.
The Full Story
When a Sun-like star runs out of nuclear fuel, it expands into a red giant and then ejects its outer layers as a planetary nebula. The remaining core becomes a white dwarf, supported by electron degeneracy pressure. Stars far more massive than the Sun can undergo core collapse after forming heavy elements up to iron. Their cores may become neutron stars if the remnant is not too massive, or black holes if gravity overwhelms all resistance. This mass threshold is a central idea in stellar evolution.
Key Facts
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"A star’s mass decides whether it ends as a white dwarf, neutron star, or black hole."