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From the Wormhole FAQ at www.webfilesuci.org/wormholeFAQ.html :
What is a black hole?
A region of intense gravitation characterized by a central point or ring of infinite energy density called a "singularity" and an enveloping surface called an "event horizon" from which nothing - not even light - can escape.
How are wormholes related to black holes?
Unlike a wormhole, a naturally occurring black hole -- one created through stellar collapse -- is not a bridge between two universes (or distant regions within the same universe). There nevertheless exist certain solutions to the Einstein equations of general relativity in which a bridge between universes - a wormhole -- appears to have a black hole at either end. This is the sense in which certain theoretically possible black holes can be said to be wormholes.
Can a traversable wormhole be used as a time machine?
Yes.
How can a traversable wormhole be turned into a time machine?
Keep one of the mouths stationary. Move the other mouth -- at speeds approaching that of light -- away from the stationary mouth for a distance of a few light years. Then return it to the vicinity of the stationary mouth. Anyone who now enters the stationary mouth will be transported years into the future. Those entering the other mouth will find themselves transported years into the past. For shorter time jumps, shorten the journey of the traveling mouth.
Is there another way to turn a traversable wormhole into a time machine?
Yes. Leave one mouth, Mouth A, in a weak (or virtually nonexistent) gravitational field. Move the other mouth, Mouth B, into a strong gravitational field, such as that near the event horizon of a black hole. Wait. Now move Mouth B from the strong gravitational field and return it to the vicinity of Mouth A. Anyone now entering Mouth A will emerge from Mouth B into the past. Anyone entering Mouth B will emerge from Mouth A into the future. For longer time jumps, wait a longer time before removing Mouth B from the strong gravitational field. Alternatively, initially move Mouth B into an even stronger gravitational field. To have an ever growing time jump, leave Mouth B in the strong gravitational field.
What else can I help you with?
At what speeds do you travel through a black hole?
Travel through a Black Hole is an impossibility, since by definition a Black Hole is a gravitational singularity with a mass so dense that not even light can escape. All notion of travel through a Black Hole is science fiction, as is the notion of time slowing down. If an object entered the Event Horizon of a Black Hole, only the observer outside the Event Horizon would perceive that object slowing down. The object inside the Event Horizon would continue as per its own 'clock' or 'object time', dragged ever into the crushing gravity of the singularity. There are some solutions that allow it. Though none exceed the speed of light.
Can energy escape thorght a black hole?
Yes, energy can escape from a black hole through Hawking radiation, which is a process where black holes emit radiation and lose mass over time. However, the escape of energy through Hawking radiation is very slow and weak in comparison to the massive gravitational pull of the black hole.
Why should you avoid a black hole if you travel in deep space?
Black holes have immense gravity that can distort space and time, pulling in anything that comes too close. Once an object crosses the event horizon of a black hole, it cannot escape, as not even light can travel fast enough to overcome the pull. This means that entering a black hole would lead to certain destruction due to the extreme forces involved.
What would happen if you went through a wormhole?
The concept of travelling through a worm hole is still science fiction. In fact the concept of a worm hole is still hypothetical. Until a worm hole is actually discovered, it is unlikely that we will ever know, if then.
Does light bend when it goes near the gravitational field of a black hole or does the light travel in a straight line through the space that has been bent by the intense gravity?
Light bends when it passes near the gravitational field of a black hole due to the curvature of space-time caused by the intense gravity of the black hole. This effect is known as gravitational lensing, and it can cause light to follow a curved path around the black hole rather than a straight line.
Is there such things as time travel?
This is possible because have you heard of a black hole are ever seen one on tv? well this black hole folds up time because it goes so quick and it has to wriggleing lines andif you went through them you could travel through time.
Which black hole can you time travel through?
This question REALLY goes deep into theoretical sciences, but most any black hole. Any black hole, that is, assuming you have a strong enough hull on your vessel, you are in a vessel that is capable of superluminal travel, and heading towards a black hole that won't totally spaghettify you. Good luck with that.
At what speeds do you travel through a black hole?
Travel through a Black Hole is an impossibility, since by definition a Black Hole is a gravitational singularity with a mass so dense that not even light can escape. All notion of travel through a Black Hole is science fiction, as is the notion of time slowing down. If an object entered the Event Horizon of a Black Hole, only the observer outside the Event Horizon would perceive that object slowing down. The object inside the Event Horizon would continue as per its own 'clock' or 'object time', dragged ever into the crushing gravity of the singularity. There are some solutions that allow it. Though none exceed the speed of light.
If you go in a black hole do you travel back in time?
Quite possibly. One thing is certain - you can't escape from a black hole.
How can you use black holes to time travel?
in brief we can not do this, but in my opinion black holes can do. I mean if you run, you need to a place that change that. but if you don't move, you don't need to place, but if we could send places to black hole then we were a witnesses, that every one place that go through black hole, time was changed for that
Do black hole can pass through time?
At one time it was believed that there were "timelike" paths through a black hole, but the problem is that all such paths necessarily intersect the singularity. In other words: if you try to use a black hole to "pass through time", the only thing you're going to pass is away.
Why is the black hole unique?
The black hole is unique because it is the only force in the unniverse to rip space time and break through the theory of relativity
Could someone put a satellite through a black hole?
They could... theoretically, at least, but it would be a waste of time and money. For one, the nearest black hole is 1600 light years away, and there is no technology that would allow us to get the satellite to the black hole within a reasonable time frame. Secondly, by putting a satellite through a black hole, you would only be destroying it.
What happens to space time around a black hole?
Space-time is probably stretched, making time seem (to an observer) to travel slower.
Time travel using a black hole?
The theory is such that if the hole is super-massive, and rotates at high speed, and you, in turn, travel at a speed high enough, you should be able to avoid spagettisation and pierce through it.
Can energy escape thorght a black hole?
Yes, energy can escape from a black hole through Hawking radiation, which is a process where black holes emit radiation and lose mass over time. However, the escape of energy through Hawking radiation is very slow and weak in comparison to the massive gravitational pull of the black hole.
What would happen if man were to travel into a black hole?
For a non-rotating black hole, a person (or a building, or a planet) would be pulverized and crushed into the singularity (point of infinite density) at the center of the black hole. However, the acceleration of particles is so great that a small black hole might cease to exist by the time the atoms actually reach the center, due to time dilation.
