Now, the idea is that gravity might be like the sound waves- it might not be confined to our membrane.
It might be able to seep off our part of the universe.
Or... think about it another way.
Instead of pool tables, let's go back to bread.
Imagine that our universe is like this slice of toast and that you and me and all of matter, light itself, everything we see, is like jelly.
Now, jelly can move freely on the surface of the toast, but otherwise, it's stuck.
It can't leave the surface itself.
But what if gravity were different?
What if gravity were more like cinnamon and sugar?
Now, this stuff isn't sticky at all, so it easily slides right off the surface.
But why would gravity be so different from everything else that we know of in the universe?
Well, turns out that string theory- or M-theory- provides an answer.
It all has to do with shape.
For years, we concentrated on strings that were closed loops, like rubber bands.
But after M-theory, we turned our attention to other kinds.
Now we think that everything we see around us, like matter and light, is made of open-ended strings, and the ends of each string are tied down to our three-dimensional membrane.
But closed loops of string do exist, and one kind is responsible for gravity.
It's called a graviton.
With closed loops, there are no loose ends to tie down, so gravitons are free to escape into the other dimensions, diluting the strength of gravity and making it seem weaker than the other forces of nature.
This suggests an intriguing possibility.
and there are parallel universes on other membranes near us, we may never see them, but perhaps we could one day feel them through gravity.
If there happens to be intelligent life on one of the membranes, then this intelligent life might be very close to us.
So theoretically, and purely theoretically, we might be able to communicate with this intelligent life by exchanging strong gravity wave sources.
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