Dark matter seems invisible, but it makes up most matter, and we have evidence that it gives the cosmos its shape. Now scientists think fusion reactors could recreate theoretical dark matter particles, so-called axions, and give researchers a better handle on dark matter’s physical properties and behavior. One of the biggest head-scratchers is dark matter, which scientists estimate makes up roughly 85 percent of all matter. We do have indirect observational evidence of dark matter, thanks to gravitational lensing. However, scientists are eager to find a dark matter particle, because a detectable physical particle could reveal much more about dark matter’s nature than we currently know.