Black holes a connundrum.

[Umbran]

Its belived once something crosses the black hole its particles becomes streched out in a line with infinite length...

This includes energywave lengths.

Actually, you're talking about a slightly different animal, BK.

You are talking about what happens to something falling into the hole. It is theorized that a physical object that falls into a black hole will, once inside, undergo what folks in the trade fancifully call "spaghettification". Tidal forces stretch the thing out to such extremes that it ends up as only a stream of particles heading towards the singularity in the center.

This can be thought of thusly - the gravitational force between two objects decreases as the distance between the objects increases. This creates the ocean tides, as the pull of the Moon on the side of the Earth nearest it is greater than on the side farthest away. The oceans are not solid, and deform into "tidal bulges" from this.

In black holes, this effect becomes extreme. If you fall in feet first, you'll reach a point where the downward pull on your feet is notably stronger than that on your head. So, your feet get pulled towards the center more quickly, and you get stretched. Eventually, it is enough to rip asunder any material you'd care to name.

The gravitational redshift of light trying to leave the hole, or the area near the hole, is not a tidal force phenomenon.

 

[pensiv]

First. A black hole isn't necessarily a "rip in space" it is a super dense star.
Second. Lots of things are going on at the event horizon (limit of visible light) of a black hole. And in fact, a couple sorts of non-visible radiation are detectable at the event horizon.
Third. There's nothing to see of a singularity. It is a dimensionless point. It neither releases any light, nor reflects it. It has no size, but it has an infinite mass. Theoretically it is possible for a singularity to exist outside of a black hole. However, I'm not sure there is any physical evidence of singularities anyway, they are theoretical constructions.

 

[Umbran]

First. A black hole isn't necessarily a "rip in space" it is a super dense star.

As far as physics knows at this time, a black hole is not just a super-dense star. Once an object collapses to the point of being "black", there is no known force in the universe that will stop the collapse to a singularity. "Rip in space" is as accurate a description as any if you aren't going to go for the math. At the singularity, the concepts of space and time cease to exist as we know them. The fabric of the universe becomes twisted and distorted beyond recognition. "Torn" is a colorful, but reasonably accurate description of spacetime at the singularity.

Second. Lots of things are going on at the event horizon (limit of visible light) of a black hole. And in fact, a couple sorts of non-visible radiation are detectable at the event horizon.

Lots of things may be happening, yes. But to first approximation we can set them aside. It is important to understand the basic characteristics of the phenomenon before we go discussing esoterics like Hawking radiation.

Third. There's nothing to see of a singularity. It is a dimensionless point. It neither releases any light, nor reflects it.

Um, well, honestly we don't know what goes on at or near the singularity. Our laws of physics are breaking down there, remember? So far as we know, there are no naked sigularities, so we cannot observe what happens there.

Theoretically it is possible for a singularity to exist outside of a black hole. However, I'm not sure there is any physical evidence of singularities anyway, they are theoretical constructions.

There is no physical evidence of them, no. As far as we can tell at the moment, nature abhors a naked singularity. The Cosmic Censorship Hypothesis seems to be holding.