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Dark matter is essential for our existence, it glues the Universe together. But how can you find something when you don’t know what it is? Caroline Steel discusses the potential candidates for particles of dark matter, the WIMP and the mysterious sterile neutrino. Photo: NASA researchers have discovered a small distant galaxy located approximately 13.4 billion light-years away from our planet. This image was captured by the Hubble Telescope. (Credit: NASA/Getty Images)