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Sun will exhaust the nuclear fuel in its core, the fuel that keeps it hot. The Sun then will shift to burning fuel in a shell around its core, and its surface will expand to engulf and fry the Earth.
Stars much heavier than the Sun burn their fuel much more quickly, and then collapse to form a neutron star or a black hole.
A black hole’s circumference is proportional to its mass: the heavier it is, the bigger it is.
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