Unveiling a Century-Old Mystery: Where the Milky Way’s Cosmic Rays Come From

The Milky Way galaxy.

Astronomers have succeeded for the first time in quantifying the proton and electron components of cosmic rays in a supernova remnant. At least 70 percent of the very-high-energy gamma rays emitted from cosmic rays are due to relativistic protons. (Image: theartofsounds2001 via Pixabay)