The Sun isn’t big enough to turn into a black hole, so it will probably end its days as a white dwarf (a small, dim star). Before that though, when it runs out of fuel in 5 billion years or so, it will swell up to several times its current size and explode, swallowing up some of the inner planets and knocking the others out of their orbits. The Earth would probably be destroyed in the process.
Not to worry, though – in 5 billions years time, we’ll have spaceships and be living on other planets, so it won’t matter if we lose Earth!
Our sun isn’t big enough to turn into a black hole – you need to be about eight times bigger than our sun to collapse into a black hole. Our sun will form a planetary nebula and settle into a white dwarf. We’d actually die from too much heat as the sun goes into a red giant phase – the sun will be so large at that point that its surface will go past the Earth’s orbit now!
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