There may be an ultraheavy explanation for the mystery surrounding the origins of the highest-energy particles ever observed.
Using data from the Keck Cosmic Web Imager, an animation has been created that "reveals a 3-D slice through a network of hydrogen gas filaments that crisscross the spaces between galaxies," according ...
A dead star accelerates protons to extreme speeds, shedding light on the origin of the most energetic cosmic rays.