Only stars with very large masses can become black
holes. But our Sun is not massive enough to become
a black hole. Four billion years from now when the
Sun runs out of the available nuclear fuel in its
core, our Sun will die a quiet death as white
dwarf stars. More massive stars, such as those
with masses of over 20 times our Sun's mass, may
eventually create a black hole.
So, do not
worry about the Sun becoming a black hole.
Now, to answer your second question: If
hypothetically the Sun would become a black hole
(which will not happen), then nothing will happen
to the Earth. Black holes do not scoop up planets.
However, as there will be no longer any sunlight,
we will have other troubles.
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