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Since the radius of a black hole is directly proportional to the mass it contains, one can safely say a massive star can make a black hole big; the more massive the star, the larger the black hole. Note that, depending on composition and some other factors, a heavy star may or may not blow out much of its mass in a spectacular explosion (supernova) and the small remnant it leaves behind may or may not be a black hole - it could potentially become a pulsar or neutron star instead. Black holes may also be companions to massive stars, and their size governed by how much mass they accumulate - since the star may supply the black hole with a fairly continuous stream of matter captured by gravitational effects from the companion star and thus the black hole continues to grow in size.

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8y ago
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15y ago

Black holes are made when a star explodes.When our sun explodes it wont create a black hole. It is way to small.The star has to be 10x bigger then our sun to create a black hole

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8y ago

They have to be at least 25 times the mass of the Sun.

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8y ago

To become a black hole the sun would have to be compacted to a diameter of about 3.7 miles, which would be the diameter of the resulting event horizon.

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Q: What star can make a black hole big?
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