How small can the smallest black hole be in the universe?

Answer 1

Oh , that's such a cool question! Well, the smallest black holes known to exist are about 3-5 times the mass of our sun. That may seem small compared to other black holes, but just think of how wonderfully unique each one is in the vast and mysterious universe! Now, let's paint some happy little stars to celebrate their beauty.

Answer 2

Honey, imagine finding a black hole smaller than my patience for ignorance –- it ain’t gonna happen. The smallest black hole we've detected is around three times the mass of our sun, and anything smaller would just be too cute to even be a proper black hole. So yeah, size does matter in the world of black holes.

Answer 3

Oh, dude, like, the smallest black hole can be the size of a nickel or something! But, like, for real, the smallest black holes are actually around 3 times the mass of the sun, which is pretty tiny in cosmic terms. So, yeah, they can be pretty small, but not like, tiny tiny if that makes sense.

Answer 4

The smallest possible size for a black hole is determined by the Schwarzschild radius, which is the radius at which the escape velocity equals the speed of light. This radius is calculated using the formula

(r_s = \frac{2Gm}{c^2}),

where (r_s) is the Schwarzschild radius, (G) is the gravitational constant, (m) is the mass of the black hole, and (c) is the speed of light.

For a black hole to exist, it must have a mass greater than its Schwarzschild radius, meaning its density is high enough for its escape velocity to exceed the speed of light. The smallest black hole possible is known as a primordial black hole, which could have formed in the early universe due to high-density regions.

Theoretically, a primordial black hole could be as small as the Planck mass, which is roughly (2.176 \times 10^{-8}) kilograms. For a black hole of this mass, its Schwarzschild radius would be incredibly small, on the order of (10^{-35}) meters. At such a tiny scale, these black holes would have evaporated rapidly due to Hawking radiation, which is the quantum effect that causes black holes to lose mass over time.

In summary, the smallest black hole in the universe would likely be a primordial black hole with a mass on the order of the Planck mass and a corresponding Schwarzschild radius on the order of the Planck length.

Answer 5

The smallest black hole in the universe can be as small as three times the mass of the sun.