quote:
Originally posted by Underlord
The only thing that can travel faster than light is space. In a black hole space is being sucked in faster than light travels, so light itself cannot escape. Very simple explination.
Einstein also concluded that gravity was not a force but a warping of space and time. Light itself is susceptible to gravity.
Also as velocity increases so does mass. If velocity is at the speed of light 
then mass is infinate.
As velocity increases time relative to the person experiencing the velocity slows down. If velocity is at the speed of light then time relative to the observer stops.
Thus to reach the speed of light is impossible. Mass would be infinate (of the object travaling at the speed of light) and time would stop (from the point of view of the observer).
This is the only (simple) explanation (without wrong conclussions) I read in this thread (as I know it).
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Thus the thing is, and what part of the theory of relativity is about, is if you would instantly start traveling at almost the speed of light, the observer who is watching you will see almost a still picture, nothing will move in his point of view. So if you are traveling for 5 years long at that speed, the observer wouldn't see this. And although you are 5 years older after that, the observer wouldn't have aged a bit (hence time is relative). Thus he wouldn't even have known you were gone. eg: if you would have traveled 50 years long and came back, the observer would instantly see you 50 years older (which would give him a heart attack for sure
).
It has everything to do with point of view, hence "time is relative", it depends on who is observing who.
quote:
Originally posted by ShawnZ
quote:
Originally posted by damm-o
I read a few days ago that some scientists said that black holes where objects that had a very large gravitational force, and it will end... giving off everything it sucked in an unrecognizable way.... i wonder how would it give light off again...
They arent objects... and they don't give everything in it back out either
They are objects. Only objects with an extremely great mass (and because of that extremely small... they think). Black holes aren't all the same either, some have a greater mass than others.
Black holes not only absorb matter, they also emit stuff. And that is exactly one of the ways to know where a black hole is. Black holes burst out radiation beams.
quote:
Originally posted by groessl35
But anyways... I don't think it really bends... and sucked into the hole... if the force of gravity in a black hole is too great for a beam of light to escape... would it stand still?
Yes, light will bend under the influence of gravity (this is also what is shown on the picture posted by Juzzi earlier in this thread). And this is how some measurements are done in space, how they know where massive objects are, etc... etc... This isn't theory or anything, this is a fact and is even used in (space)science to measure stuff.
Also, if the force of gravity in an object is too great for a beam of light to escape we (thus the observers) would see only blackness and call that object a black hole.
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