Here is a link to a scientific publication detailing the large scale structure of the entire Universe.

[link to www.mpa-garching.mpg.de]

It's wonderful. It looks like synapses in a brain!

The main result is that the Universe is not homogeneous. There are regions with high density (galactic clusters) and regions with very low density of both matter and dark matter.

These regions are also connected by high density filaments that may indicate the presence of cosmic strings, thus providing first semi-experimental support for the string theory. It's semi-empirical, since this is a simulation based on experimental data and simulations should never be taken for actual representation of reality.

So far the main problem with the string theory has been our inability to experimentally (in)validate its predictions - a fatal flaw in any physical theory. All natural sciences feature of several competing theories that are neither right or wrong until they're put to the test against experiments. Before such a test is conducted, they are only hypotheses that are merely what-if scenarios with no scientific validity.