The Universe's Dark Secret: Where Did All the Antimatter Go?

Electrons and their antimatter counterparts, positrons, interact around a neutron star in this visualization. Why is there so much more matter than antimatter in the universe we can see? (Image: © NASA's Goddard Space Flight Center)

The universe ought to be swimming with antimatter, and scientists aren't quite sure where it all went. Paul Sutter, community outreach coordinator at the Center for Cosmology and AstroParticle Physics, explains the conundrum.

It's a cosmic whodunit.

Paul M. Sutter is an astrophysicist at The Ohio State University, host of Ask a Spaceman and Space Radio, and author of Your Place in the Universe. Sutter contributed this article to Space.com's Expert Voices: Op-Ed & Insights.