| UPDATED: 09:39, Sat, Jan 16, 2021 Link copied Sign up for FREE for the biggest new releases, reviews and tech hacks SUBSCRIBE Invalid email When you subscribe we will use the information you provide to send you these newsletters. Sometimes they'll include recommendations for other related newsletters or services we offer. Our Privacy Notice explains more about how we use your data, and your rights. You can unsubscribe at any time. Axions are theoretically created in stars' cores and transform into particles of light called photons under the influence of magnetic fields. And these hypothetical axion entities may also dark matter - the elusive substance accounting for as much as 85 percent of the Universe’s total mass.