Perhaps dark matter is made of an entirely different kind of particle than the ones physicists have been searching for. New experiments are springing up to look for these ultra-lightweight phantoms.
https://www.wired.com/story/the-hunt-for-ultralight-dark-matter/?utm_source=dlvr.it&utm_medium=blogger
https://www.wired.com/story/the-hunt-for-ultralight-dark-matter/?utm_source=dlvr.it&utm_medium=blogger