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About 30 kilometers in diameter. This refers to the "event horizon". Actually this diameter is directly proportional to the mass: at twice the mass, a black hole will have twice the diameter.

Stellar black holes have been found with estimated diameters from about 20 kilometers upwards.

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10y ago
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10y ago

That really depends a lot on the size of the black hole. A supermassive black hole, in the center of a galaxy, has millions, or even billions, of times the mass of the Sun. Due to its mass, such a black hole has a much stronger attraction than a "stellar" black hole - the remain of a collapsing star, which of course won't attract you more than the star itself did during its lifetime - unless the black hole acquired more mass in the meantime.

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14y ago

The nearest known black hole is at a distance of several thousand light-years. Since Saturn is very near to us by comparison, it doesn't make any difference if you ask about the distance from the Solar System, from the Sun, from Earth, or from Saturn.

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11y ago

The singularity of a black hole is for all intents and purposes a geometric point.

The radius of the event horizon depends on the mass and the type of black hole.

For the simplest (non-charged, non-rotating) kind (a Schwarzschild hole), the radius

of the event horizon is directly proportional to the mass.

The mass of a black hole can range from a few solar masses, on up to the mass

of a small galaxy.

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11y ago

Quite a distance! The nearest black hole that we are aware of is the Cygnus X-1 x-ray source in the constellation Cygnus. This object is about 6,100 light years away, and is detectable only by the x-ray radiation emitted from its companion blue giant star.

As black holes go, we believe that it's pretty small, perhaps near the minimum sustainable size for black holes. It's "only" about 15 solar masses.

There may be nearer black holes that are not close to any stars; these would not radiate appreciably, and would be essentially indetectable.

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8y ago

Yes, but they are microscopic. When atoms smash, they sometimes create miniature black holes that quickly evaporate through Hawking radiation. But to make a destructive black hole is not possible.

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11y ago

A 'black hole' is a singularity ... its physical size is zero.

The diameter of its event horizon depends on its mass.

For a hole with mass equal to the sun, the event horizon is about

2.95 kilometers from the central point. I calculated that myself, so

please think of it as only an opinion.

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9y ago

The closest KNOWN black hole is at a distance of 3000 light-years. It seems very likely (to me, at least) that there are black holes that are closer to us, but that haven't been discovered yet.

The supermassive black hole at the center of the Milky Way is at a distance of about 28,000 light-years.

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14y ago

The nearest known black hole is at a distance of several thousand light-years. Since Saturn is very near to us by comparison, it doesn't make any difference if you ask about the distance from the Solar System, from the Sun, from Earth, or from Saturn.

The nearest known black hole is at a distance of several thousand light-years. Since Saturn is very near to us by comparison, it doesn't make any difference if you ask about the distance from the Solar System, from the Sun, from Earth, or from Saturn.

The nearest known black hole is at a distance of several thousand light-years. Since Saturn is very near to us by comparison, it doesn't make any difference if you ask about the distance from the Solar System, from the Sun, from Earth, or from Saturn.

The nearest known black hole is at a distance of several thousand light-years. Since Saturn is very near to us by comparison, it doesn't make any difference if you ask about the distance from the Solar System, from the Sun, from Earth, or from Saturn.

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14y ago

Considering that the closest black hole to earth is 1,600 light years away, and the fact the the furthest the astronauts have gotten from earth is about 225,622 miles (distance to the moon), they really haven't gotten any closer to a black hole than anyone else.

[1 light year = 5,878,499,810,000 miles]

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