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This image shows a multitude of faint galaxies. Those with clear and regular structures are only up to a few billion light-years away. The fainter objects are about 10 billion light-years. Images such as this one are tools to study dark matter, which cannot be seen, in galaxies. Some of the closer galaxies act as lenses that distort the light coming from more distant ones. By measuring this distortion astronomers are able to understand how dark matter is distributed in the objects acting as lenses.

CREDIT: ESO.

Source:
http://www.eso.org/public/images/potw1202a/