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dark matter

Science has been working to shed light on the nature of the Universe for 400 years. Alberto Pomares/iStockphoto.com hide caption

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Alberto Pomares/iStockphoto.com

This image of the galaxy cluster Abell 520 — 2.4 billion light-years away — may challenge some of our basic theories about Dark Matter. It is overlaid with false-color maps showing concentrations of starlight (orange), hot gas (green) and mass (blue). The mass is mostly Dark Matter. M.J. Jee and A. Mahdavi/NASA/ESA/CFHT/CXO hide caption

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M.J. Jee and A. Mahdavi/NASA/ESA/CFHT/CXO