Astronomers don't know what dark matter is, but they do know it takes up approximately 25% of the Universe. We can't see it, but we can measure the effect of its gravity on stars and galaxies. A powerful detector, deep underground in a mineshaft in Minnesota might be able to get to the bottom of the mystery. The Cryogenic Dark Matter Search II project will attempt to detect Weakly Interacting Massive Particles (aka WIMPS). These theoretical particles don't normally interact with matter, but the occasional rare collision might be detectable.
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