Researchers propose methods to spot primordial black holes | The tiny, hypothetical objects could explain some or all of the universe’s dark matter, and their presence could produce detectable shifts in planetary orbits

>If they exist, primordial black holes in this mass range [could explain some or all of the universe’s dark matter](https://www.sciencenews.org/article/ligo-black-holes-dark-matter). That unknown invisible source of mass exerts gravitational influence on galaxies and, perplexingly, seems to outweigh normal matter by about 6 to 1. Extensive searches for subatomic particles that could explain dark matter [have come up empty](https://www.sciencenews.org/article/dark-matter-wimps-lz), putting new focus on primordial black holes. 

[Read more here](https://www.sciencenews.org/article/primordial-black-holes-solar-system), and [the research here](https://journals.aps.org/prd/abstract/10.1103/PhysRevD.110.063533)