The Event Horizion...?

Question

If Earth was pulled in an event horizion how long would we stay there and what effects would we feel? How long would it take to reach the singularity point?

Answer 1

It depends on the black hole.

If it were the massive one at the centre of our galaxy, we would notice nothing at all. We would cross it no faster than we are moving at present, and it would be a very long time before we reached the singularity.

Other black holes would be different. The tidal forces at the event horizon themselves would be very noticeable, and may pull us apart.

But there is nothing unduly special about the event horizon except for the fact you can only cross it in one direction.

Answer 2

The Earth would never be "pulled" into an event horizon. The Black Holes don't pull or suck anything in. They have gravitational field just like any other massive body that exhibits the same gravitational characteristics. You can't tell the difference between the gravitational field of a black hole and any other equally massive body in space. If the earth was moving in space and crossed over the event horizon of a black hole it would then continue to fall into the singularity. It would be then stretched (as the part of it nearest the singularity fell faster than the side away from the singularity) to pieces. How long it would take would depend on the size (massiveness) of the black hole.

Answer 3

In general relativity, event horizon is a general term for a boundary in spacetime, defined with respect to an observer, beyond which events cannot affect the observer. Light emitted beyond the horizon can never reach the observer, and anything that passes through the horizon from the observer's side is never seen again. A black hole is surrounded by an event horizon, for example. This means that an outside observer cannot be affected by anything inside the black hole.

More specific types of horizons include the related but distinct absolute and apparent horizons found around a black hole. Still other distinct notions include the Cauchy and Killing horizon; particle and cosmological horizons relevant to cosmology; and isolated and dynamical horizons important in current black hole research.

A misconception concerning event horizons, especially black hole event horizons, is that they represent an immutable surface that destroys objects that approach them. In practice, several features are common to all event horizons: they appear to be some distance away from any observer, and objects sent towards an event horizon never appear to cross it from the sending observer's point of view (as the horizon-crossing event's light cone never intersects the observer's world line). Attempting to make an object approaching the horizon remain stationary with respect to an observer requires applying a force whose magnitude becomes unbounded (becoming infinite) the closer it gets.

For the case of a horizon perceived by a uniformly accelerating observer in empty space, the horizon seems to remain a fixed distance from the observer no matter how its surroundings move. Varying the observer's acceleration may cause the horizon to appear to move over time, or may prevent an event horizon from existing, depending on the acceleration function chosen. The observer never touches the horizon, and never passes a location where it appeared to be.

For the case of a horizon perceived by an occupant of a de Sitter universe, the horizon always appears to be a fixed distance away for a non-accelerating observer. It is never contacted, even by an accelerating observer.

For the case of the horizon around a black hole, observers stationary with respect to a distant object will all agree on where the horizon is. While this seems to allow an observer lowered towards the hole on a rope to contact the horizon, in practice this cannot be done. If the observer is lowered very slowly, then, in the observer's frame of reference, the horizon appears to be very far away, and ever more rope needs to be paid out to reach the horizon. If the observer is lowered quickly, then indeed the observer, and some of the rope can touch and even cross the (distant lowerer's) event horizon. If the rope is pulled taut to fish the observer back out, then the forces along the rope increase without bound as they approach the event horizon, and at some point the rope must break. Furthermore, the break must occur not at the event horizon, but at a point where the lowerer can observe it.

Attempting to stick a rigid rod through the hole's horizon cannot be done: if the rod is lowered extremely slowly, then it is always too short to touch the event horizon, as the coordinate frames near the tip of the rod are extremely compressed. From the point of view of an observer at the end of the rod, the event horizon remains hopelessly out of reach. If the rod is lowered quickly, then the same problems as with the rope are encountered: the rod must break and the broken off pieces inevitably fall in.

These peculiarities only occur because of the supposition that the observers be stationary with respect to some other distant observer. Observers that fall into the hole are moving with respect to the distant observer, and so perceive the horizon as being in a different location, seeming to recede in front of them so that they never contact it. Increasing tidal forces (and eventual impact with the hole's gravitational singularity) are the only locally noticeable effects. While this seems to allow an infalling observer to relay information from objects outside their perceived horizon but inside the distant observer's perceived horizon, in practice the horizon recedes by an amount small enough that by the time the infalling observer receives any signal from farther into the hole, they've already crossed what the distant observer perceived to be the horizon, and this reception event (and any retransmission) can't be seen by the distant observer.

Answer 4

There are various theories, but I don't think anyone knows for certain. One theory is that the gravitational force is so powerful it bends time and space, so time slows at the event horizon. According to this theory, the time at the event horizon would seem very long from the viewpoint of anyone still alive on the doomed planet, but I think it's highly unlikely that anyone would survive that long.

Answer 5

EYE really don't think you wanna know.....OKAy let me be the first to tell you that if the earth was swallowed whole by a blackhole, your mind would slowly start to turn inside out, more like a cooked piece of plastic,something....All light becomes darkness,except.....a single beacon of true light otherwise known as the minds' third eye. This unprecedented event between your mind and this unbelievable unbalance of gravity is in a battle for the very thing which makes you the special creature in the whole entire universal audience: Your seven holy angels and the one thing which keeps those angels clean and holy, your MINDs' EyE. So remember, the moral to my dictation is, try not to be too intelligent.

Answer 6

Gravitational time dilation would make it take forever (as measured by an outside observer) to reach the event horizon. After passing the event horizon, I have no idea.

Answer 7

Anything that could penetrate the surface of a black hole would have to travel faster than the speed of light once inside.
this renders the black hole a nonviable entity!