# When does the event horizon form?

• Flatland
In summary, the event horizon forms when a black hole is created through the collapse of a massive star or the merging of two smaller black holes. The time it takes for an event horizon to form varies depending on the size and mass of the black hole, ranging from a few milliseconds for small black holes to millions of years for supermassive black holes. The event horizon is a permanent feature of a black hole and cannot disappear, although its size and shape can change as the black hole's mass changes. We cannot directly see the event horizon of a black hole, but we can observe its effects indirectly. The size and shape of the event horizon can vary between black holes, depending on their size, mass, and other factors such as rotation and
Flatland
As a massive star begins it's collapse into a singularity, at what stage does the event horizon form?

When it reaches the Schwarzschild limit.

Is it possible to halt the implosion beyond the schwarzchild limit by spinning it fast enough?

## 1. When does the event horizon form?

The event horizon forms when a black hole is created, either through the collapse of a massive star or the merging of two smaller black holes. It is not a sudden process, but rather a gradual formation as the black hole's mass increases and its gravitational pull becomes stronger.

## 2. How long does it take for an event horizon to form?

The time it takes for an event horizon to form varies depending on the size and mass of the black hole. Generally, it takes a few milliseconds for a small black hole to form, while it can take millions of years for a supermassive black hole to form.

## 3. Can an event horizon disappear?

No, an event horizon cannot disappear. It is a permanent feature of a black hole and cannot be altered or removed. However, the size and shape of the event horizon can change as the black hole's mass increases or decreases.

## 4. Can we see the event horizon of a black hole?

No, we cannot see the event horizon of a black hole. The event horizon marks the boundary of the black hole, and nothing, including light, can escape from it. However, we can indirectly observe the effects of the event horizon, such as the bending of light and the release of radiation from the accretion disk around the black hole.

## 5. Is the event horizon the same for all black holes?

No, the event horizon can vary in size and shape depending on the size and mass of the black hole. Smaller black holes will have smaller event horizons, while larger black holes will have larger event horizons. Additionally, the shape of the event horizon can be distorted by factors such as rotation and the presence of a surrounding accretion disk.

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