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.
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Stars much heavier than the Sun burn their fuel much more quickly, and then collapse to form a neutron star or a black hole.
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A black hole’s circumference is proportional to its mass: the heavier it is, the bigger it is.
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