http://www.newsweek.com/mysterious-barrier-blocking-cosmic-rays-heart-milky-way-central-molecular-zone-1648683

New observations of the center of our galaxy, the Milky Way, have revealed that something is blocking cosmic rays from passing into it.

As well as suggesting the Central Molecular Zone (CMZ)—that rings the center of the Milky Way—is somehow blocking cosmic rays, the findings could indicate the presence of a massive high-energy natural particle accelerator at the heart of our galaxy.