Flat Universe & Sound Waves In A Black Hole

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Hello. I'm looking into the description of the universe as being flat and wondering where I could find information regarding the reasoning behind that description. When someone describes the universe as "flat" what are they referring to in perspective?

The blackhole in the Perseus cluster gives off the lowest note ever detected in the universe. How is this so? Doesn't sound travel slower than light? If light cannot escape a black hole how come sound waves can?

Lisa Pruitt

Hi - The Universe IS round because from any point space goes out in every direction. If the universe is experienced as flat its because something else has happened so that a flat idea is manifesting. That could be space going out from a place in one direction so that you get, instead of a round idea manifesting, a flat, one directional idea. At the periphery of anywhere its round, going around like a circle. If each spot on that circle connects with the one next to it, you get a square affect happening. Can you figure that out - I don't know how to draw here.
If everything has what was in it before, you would get a circle inside the square. That would continue on (another square, then another circle) it would continue on getting smaller. The very fact of that happening turns into something moving. It begins from one square, and will be picked up and other squares will do the same, each going further than the first. It will go on and on, all having a memory of the first. Then, when the original space possibilities are used up, the memory will began to go back to the beginning and you get a black hole.

Flat Universe & Sound Waves In A Black Hole

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