Dark matter particles won’t kill you. If they could, they would have already

A lack of mysterious deaths from hypothetical ‘macros’ suggests dark matter is small and dense

macros

STRIKETHROUGH  Hypothetical dark matter particles called “macros” could stream through space and constantly bombard Earth. Some could seriously injure any unlucky humans they pass through, but a lack of mysterious deaths suggests the biggest potential macros don’t exist.

JPL-Caltech/NASA

The fact that no one seems to have been killed by speeding blobs of dark matter puts limits on how large and deadly these particles can be, a study posted July 18 at arXiv.org