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Dark matter particles might be even smaller than we thought they were, and even better at interacting with normal matter. If that’s the case, we’ve been hurting our chances at spotting them by burying our detectors kilometres underground.
Nobody is quite sure what dark matter is. The most popular theory says it is probably made of weakly-interacting massive particles (WIMPs), which are relatively heavy but which pass right through normal matter instead of bouncing off of it.
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The detectors we use to find those particles are usually placed deep in mine shafts because the rock above them will deflect unwanted background radiation like cosmic rays while allowing dark matter particles to pass through unhindered. But if dark matter particles are able to crash into or bounce off of regular matter, Timon Emken and Chris Kouvaris at the University